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All Problems

Strings

Printing

Output a string to the console

Write the string "Hello World!" to STDOUT

python

print "Hello World!"

fsharp

printfn "Hello World!"

fantom

echo("Hello World!")

groovy

println "Hello World!"

haskell

main = putStrLn "Hello World!"

Retrieve a string containing ampersands from the variables in a url

My PHP script first does a query to obtain customer info for a form. The form has first name and last name fields among others. The customer has put entries such as "Ron & Jean" in the first name field in the database. Then the edit form script is called with variables such as

"http://myserver.com/custinfo/edit.php?mode=view&fname=Ron & Jean&lname=Smith".

The script variable for first name $_REQUEST['firstname'] never gets beyond the "Ron" value because of the ampersand in the data.

I have tried various functions like urldecode but all to no avail. I even tried encoding the url before the view screen is painted so that the url looks like "http://myserver/custinfo/edit.php?mode=view&fname="Ronxxnbsp;xxamp;xxnbsp;Jean"&lname=SMITH". (sorry I had to add the xx to replace the ampersand or it didn't display meaningful url contents the browser sees.)

Of course this fails for the same reasons. What is a better approach?

python

# I'm not really sure this is what the site is for,
# but the one unsolved problem for python was grating me.
# Anyway, I think this is what you're looking for.

from urllib import urlencode

query_dict = {'mode': 'view',
'fname': 'Ron & Jean',
'lname': 'Smith'}

print urlencode(query_dict.items())

# Which will be 'lname=Smith&mode=view&fname=Ron+%26+Jean'.

fsharp

//the problem arises due to the fact that you've attempted to apply HTML entities encoding rather than URL encoding to your data!
//in F#, for example, assuming you would call this function with fname and lname parameters, this would produce the desired output
let getProperUrl fname lname = sprintf "http://myserver.com/custinfo/edit.php?mode=view&fname=%s&lname=%s" (HttpUtility.UrlEncode fname) (HttpUtility.UrlEncode lname)

// Example that shows encoding and decoding:
let queryString =
let fname = HttpUtility.UrlEncode("Ron & James")
let lname = HttpUtility.UrlEncode("Smith & Jones")
sprintf "http://myserver.com/custinfo/edit.php?mode=view&fname=%s&lname=%s" fname lname
/// All parameters in the URL as a lookup map
let parameters =
let paramStart = queryString.IndexOf('?')
if paramStart < 0 then
Map.empty
else
let values =
queryString.Substring(paramStart + 1)
|> HttpUtility.ParseQueryString
values.AllKeys
|> Seq.map (fun key -> key, values.[key])
|> Map.ofSeq
let fname = parameters.TryFind("fname")
let lname = parameters.TryFind("lname")

fantom

encoded := `http://myserver.com/custinfo/edit.php`.plusQuery(
["fname":"Ron & Jean", "lname":"Smith"]).encode
echo(encoded)

groovy

// Given the nature of the question text, I am assuming the question
// is how to produce a application/x-www-form-urlencoded compliant string

def basename = 'http://somedomain.com/somebase/'
def parameter = 'Bart & Lisa'
// equivalent to php
println basename + URLEncoder.encode(parameter)
// recommended approach is to specify encoding
println basename + URLEncoder.encode(parameter, "UTF-8")

haskell

import Network.CGI

query = "http://myserver.com/custinfo/edit.php?" ++ formEncode [("mode", "view"), ("fname", "Ron & Jan"), ("lname","Smith")]

string-wrap

Wrap the string "The quick brown fox jumps over the lazy dog. " repeated ten times to a max width of 78 chars, starting each line with "> "

Expected output:
> The quick brown fox jumps over the lazy dog. The quick brown fox jumps over t
> he lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox
> jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The qui
> ck brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy
> dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps o
> ver the lazy dog. The quick brown fox jumps over the lazy dog.

python

def wrap(string, length):

while len(string):
print("> " + string[0:length - 1])
string = string[length - 1:].strip()

wrap("The quick brown fox jumps over the lazy dog. " * 10, 78)

fantom

s:=Str[,].fill("The quick brown fox jumps over the lazy dog. ",10).join
while(s.size>0){
echo("> "+s[0..(77.min(s.size))-1])
s=(s.size>77)?s[77..-1].trim : ""
}

groovy

'The quick brown fox jumps over the lazy dog. '.multiply(10).split('(?<=\\G.{76})').each{println '> ' + it}

st = "The quick brown fox jumps over the lazy dog. " * 10
width = 76
while(st){
(first, st) = st.length() > width? [st[0..width], st[(width+1)..-1].trim()] : [st, null]
println "> $first"
}

haskell

wrap str
| length str <= 77 = [str]
| otherwise = [take 77 str] ++ wrap (drop 77 str)

mapM_ putStrLn . map ("> " ++) . wrap . concat . replicate 10 $ "The quick brown fox jumps over the lazy dog. "

Declaration

Define a string containing special characters

Define the literal string "\#{'}${"}/"

python

# yes, Python has way too many forms of string literals :)
print "\\#{'}${\"}/"
print "\\#{'}${"'"'"}/"
print r"""\#{'}${"}/"""
print '\\#{\'}${"}/'
print '\\#{'"'"'}${"}/'
print r'''\#{'}${"}/'''

fsharp

let special = "\#{'}${\"}/"

fantom

special := Str<|\#{'}${"}/|>

groovy

special = "\\#{'}\${\"}/"

special = '\\#{\'}${"}/'

special = /\#{'}${'$'}{"}\//

haskell

putStrLn "\"\\#{'}${\"}/\""

let special = "\\#{'}${\"}/"

Define a multiline string

Define the string:

"This

Is

A

Multiline

String"

python

text = """This
Is
A
Multiline
String"""

# with proper indentation
text = (
"This\n"
"Is\n"
"A\n"
"Multiline\n"
"String"
)

fsharp

let multiline = "This\nIs\nA\nMultiline\nString"

let multiline = "This
Is
A
Multiline
String"

fantom

s := "This
Is
A
Multiline
String"

groovy

def text =
"""This
Is
A
Multiline
String"""

def text = "This\nIs\nA\nMultiline\nString"

haskell

s = "This \
\Is \
\A \
\Multiline \
\String"

Define a string containing variables and expressions

Given variables a=3 and b=4 output "3+4=7"

python

class EvalDict(dict):
def __getitem__(s, k):
return eval(k, s)

a=3; b=4
"%(a)d+%(b)d=%(a+b)d" % EvalDict(locals())

a=3; b=4
"%d+%d=%d" % (a, b, a+b)

fsharp

let a, b = 3, 4
let mystr = sprintf "%d+%d=%d" a b (a+b)
printfn "%s" mystr

fantom

echo("$a+$b=${a+b}")

groovy

println "$a+$b=${a+b}"

printf "%d+%d=%d\n", a, b, a + b

haskell

import Text.Printf

main = do
let a = 3
let b = 4
printf "%d+%d=%d" a b (a + b)

a = 3
b = 4
s = show a ++ "+" ++ show b ++ "=" ++ show (a + b)
main = putStrLn s

Manipulation

Reverse the characters in a string

Given the string "reverse me", produce the string "em esrever"

python

"reverse me"[::-1]

fsharp

let reversed = new String (Array.rev ("reverse me".ToCharArray()))

let word = "reverse me"
//reverse the word
let reversedword =
word.ToCharArray()
|> Array.fold(fun acc x -> x::acc) []

fantom

"reverse me".reverse

groovy

reversed = "reverse me".reverse()

haskell

reverse "reverse me"

Reverse the words in a string

Given the string "This is a end, my only friend!", produce the string "friend! only my end, the is This"

python

' '.join(reversed("This is a end, my only friend!".split()))

fsharp

let reversed = String.Join(" ", Array.rev("This is the end, my only friend!".Split [|' '|]))

fantom

"This is a end, my only friend!".split.reverse.join(" ")

groovy

reversed = "This is the end, my only friend!".split().reverse().join(' ')

reversed = "This is the end, my only friend!".tokenize(' ').reverse().join(' ')

def revdelim(c, s) { StringUtils.reverseDelimited(s, c) }
revwords = this.&revdelim.curry(" " as char)
reversed = revwords("This is the end, my only friend!")

reversed = StringUtils.reverseDelimited("This is the end, my only friend!", " " as char)

haskell

unwords (reverse (words "This is the end, my only friend!"))

Text wrapping

Wrap the string "The quick brown fox jumps over the lazy dog. " repeated ten times to a max width of 78 chars, starting each line with "> ", yielding this result:

> The quick brown fox jumps over the lazy dog. The quick brown fox jumps
> over the lazy dog. The quick brown fox jumps over the lazy dog. The
> quick brown fox jumps over the lazy dog. The quick brown fox jumps
> over the lazy dog. The quick brown fox jumps over the lazy dog. The
> quick brown fox jumps over the lazy dog. The quick brown fox jumps
> over the lazy dog. The quick brown fox jumps over the lazy dog. The
> quick brown fox jumps over the lazy dog.

python

import textwrap
print textwrap.fill("The quick brown fox jumps over the lazy dog. " * 10,
72, initial_indent="> ", subsequent_indent="> ")

fsharp

let prefix = "> "
let input = "The quick brown fox jumps over the lazy dog. "

(String.split ['\n'] (textwrap (copies input 10) (73 - prefix.Length))) |> List.iter (fun line -> printfn "%s%s" prefix line)

let output maxWidth (s: string) =
let rec wrap = function
| lineSoFar, ([| |]: string array)-> printfn "%s" lineSoFar
| ">" as lineSoFar, (words: string array) ->
// Handle this case separately, thus we can also deal with
// cases where a word is longer then the max width
wrap (lineSoFar + " " + words.[0], Array.sub words 1 (words.Length - 1))
| lineSoFar, words when words.[0].Length + lineSoFar.Length >= maxWidth ->
printfn "%s" lineSoFar
wrap (">", words)
| lineSoFar, words ->
wrap(lineSoFar + " " + words.[0], Array.sub words 1 (words.Length - 1))
wrap (">", s.Split([| ' ' |]))

[| for i in 1 .. 10 do yield "The quick brown fox jumps over the lazy dog." |]
|> String.concat " "
|> output 78

fantom

buf := Buf()
10.times { buf.writeChars("The quick brown fox jumps over the lazy dog. ") }
buf.flip

out := Env.cur.out
sep := ">"; max := 72 - sep.size - 1
acc := 0; Str? s := null
while ((s = buf.readStrToken) != null)
{
if (acc == 0)
out.print(sep)

acc += s.size
if (acc > max)
{
out.print("\n$sep")
acc = s.size
}
out.print(" $s")
buf.readStrToken(4096) { !it.isSpace }
acc++
}

groovy

// no built-in fill, define one using brute force approach
def fill(text, width=80, prefix='') {
width = width - prefix.size()
def out = []
List words = text.replaceAll("\n", " ").split(" ")
while (words) {
def line = ''
while (words) {
if (line.size() + words[0].size() + 1 > width) break
if (line) line += ' '
line += words[0]
words = words.tail()
}
out += prefix + line
}
out.join("\n")
}
println fill('The quick brown fox jumps over the lazy dog. ' * 10, 72, '> ')

// no built-in fill, define one using lastIndexOf
def fill(text, width=80, prefix='') {
def out = ''
def remaining = text.replaceAll("\n", " ")
while (remaining) {
def next = prefix + remaining
def found = next.lastIndexOf(' ', width)
if (found == -1) remaining = ''
else {
remaining = next.substring(found + 1)
next = next[0..found]
}
out += next + '\n'
}
out
}
println fill('The quick brown fox jumps over the lazy dog. ' * 10, 72, '> ')

prefix = '> '
input = 'The quick brown fox jumps over the lazy dog. '
wrap(input * 10, 72 - prefix.size()).eachLine{ println prefix + it }

haskell

import Data.List (intercalate)

-- our list of words ["The", "quick", "brown", ...]
dogs = concat$ replicate 10$ words "The quick brown fox jumps over the lazy dog."

-- ["The", "The quick", "The quick brown", ...]
concats = scanl1 (\s v -> s ++ " " ++ v)

-- takes list of words, returns list of lines
wordwrap :: Int -> [String] -> [String]
wordwrap maxwidth [] = []
wordwrap maxwidth ws = sentence : (wordwrap maxwidth restwords)
where
zipped = zip (concats ws) ws
(sentences, rest) = span (\(s,w) -> (length s) <= maxwidth) zipped
sentence = last (map fst sentences)
restwords = map snd rest

main = putStrLn ("> " ++ intercalate "\n> " (wordwrap 76 dogs))

Remove leading and trailing whitespace from a string

Given the string " hello " return the string "hello".

python

assert 'hello' == ' hello '.strip()

fsharp

let s = " hello "
let trimmed = s.Trim()

let trimmed = " hello ".Trim()

fantom

s := " hello ".trim

groovy

assert "hello" == " hello ".trim()

haskell

unwords (words " hello ")

Simple substitution cipher

Take a string and return the ROT13 and ROT47 (Check Wikipedia) version of the string.
For example:
String is: Hello World #123
ROT13 returns: Uryyb Jbeyq #123
ROT47 returns: w6==@ (@C=5 R`ab

python

# rot13, readable
rot13_tbl = string.maketrans("ABCDEFGHIJKLMabcdefghijklmNOPQRSTUVWXYZnopqrstuvwxyz", "NOPQRSTUVWXYZnopqrstuvwxyzABCDEFGHIJKLMabcdefghijklm")
string.translate("Hello World #123", rot13_tbl)

#
# "a bad programmer can write bad code in any language"
#

# rot13, "clever"
string.translate("Hello World #123", string.maketrans(string.lowercase+string.uppercase, string.lowercase[13:]+string.lowercase[:13]+string.uppercase[13:]+string.uppercase[:13]))

# rot47, very "clever"
''.join([ord(c) in range(33,127) and chr(((ord(c)-33+47)%(127-33))+33) or c for c in "Hello World #123"])

"Hello World #123".encode('rot13')

fsharp

#light

let rotChar (s:int) (l:int) (h:int) (c:char) =
let charCode = int c
let letterCount = h - l + 1
let newCharCode = (charCode - l + s) % letterCount + l
char newCharCode

let rot13 (text:string) =
let rotChar13 = function
| (c:char) when 'A' <= c && c <= 'Z' -> rotChar 13 (int 'A') (int 'Z') c
| c when 'a' <= c && c <= 'z' -> rotChar 13 (int 'a') (int 'z') c
| c -> c
new string([| for c in text -> rotChar13 c|])

let rot47 (text:string) =
let rotChar47 = function
| ' ' as c -> c
| c -> rotChar 47 (int '!') (int '~') c
new string([| for c in text -> rotChar47 c |])

fantom

rot := |Str s, |Int c -> Int| remap -> Str|
{
rs := ""
s.each { rs += remap(it).toChar }
return rs
}

rot13 := |Str s -> Str|
{
rot(s) |Int c -> Int|
{
lc := c.lower
c += (lc >= 'a' && lc <= 'm') ? 13
: ((lc >= 'n' && lc <= 'z') ? -13 : 0)
return c
}
}

rot47 := |Str s -> Str|
{
rot(s) |Int c -> Int|
{
c += (c >= '!' && c <= 'O') ? 47
: ((c >= 'P' && c <= '~') ? -47 : 0)
return c
}
}

s := "Hello World #123"
echo("s=$s")
echo("rot13=${rot13(s)}")
echo("rot47=${rot47(s)}")

groovy

char rot13(s) {
char c = s
switch(c) {
case 'A'..'M': case 'a'..'m': return c+13
case 'N'..'Z': case 'n'..'z': return c-13
default : return c
}
}
String.metaClass.rot13 = {
delegate.collect(this.&rot13).join()
}

from = '!"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~'
to = 'PQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~!"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNO'
String.metaClass.rot47 = {
delegate.collect{ int found = from.indexOf(it); found < 0 ? it : to[found] }.join()
}

assert 'Hello World #123'.rot13() == 'Uryyb Jbeyq #123'
assert 'Hello World #123'.rot47() == 'w6==@ (@C=5 R`ab'

haskell

Case

Make a string uppercase

Transform "Space Monkey" into "SPACE MONKEY"

python

"Space Monkey".upper()

fsharp

printfn "%s" ("Space Monkey".ToUpper())

printfn "%s" (String.uppercase "Space Monkey")

fantom

s := "Space Monkey".localeUpper

groovy

println "Space Monkey".toUpperCase()

haskell

toUpperCase oldstring converted = if oldstring == ""
then converted
else toUpperCase (tail(oldstring)) (converted ++ [Char.toUpper(head(oldstring))])

toUpperCase "Space Monkey" ""

toUpperCase = map Char.toUpper

toUpperCase "Space Monkey"

Make a string lowercase

Transform "Caps ARE overRated" into "caps are overrated"

python

"Caps ARE overRated".lower()

fsharp

printfn "%s" ("Caps ARE overRated".ToLower())

printfn "%s" (String.lowercase "Caps ARE overRated")

fantom

s := "Caps ARE overRated".localeLower

groovy

println "Caps ARE overRated".toLowerCase()

haskell

import Char
str = map toLower "Caps ARE overRated"

Capitalise the first letter of each word

Transform "man OF stEEL" into "Man Of Steel"

python

from string import capwords
capwords("man OF stEEL")

' '.join(s.capitalize() for s in "man OF stEEL".split())

"man OF stEEL".title()

fsharp

let words = String.Join(" ", Array.map (fun (s : String) -> (String.capitalize (s.ToLower()))) ("man OF stEEL".Split [|' '|]))

let wordlst = List.map (fun s -> (String.capitalize (String.lowercase s))) (String.split [' '] "man OF stEEL")
let words = new StringBuilder(List.hd wordlst)
for (s : String) in (List.tl wordlst) do (words.Append(" ").Append(s))

// Previous solutions used old library functions, here's something that works with F# 2.0
let s= "man OF stEEL"
let UpperFirst = function | "" -> "" | s -> s.Substring(0,1).ToUpper() + s.Substring(1).ToLower()
s.Split(' ') |> Array.map UpperFirst |> String.concat " "

let culture = System.Globalization.CultureInfo.GetCultureInfo("en-US")
let titleCase = culture.TextInfo.ToTitleCase "man oF sTeel"

fantom

"man OF stEEL".split.map { it.localeLower.localeCapitalize }.join(" ")

groovy

def capitalize(s) { s[0].toUpperCase() + s[1..-1].toLowerCase() }
caps = "man OF stEEL".replaceAll(/\w+/) { w -> capitalize(w) }

caps = "man OF stEEL".replaceAll(/\w+/) { w -> StringUtils.capitalize(w.toLowerCase()) }

caps = WordUtils.capitalizeFully("man OF stEEL")

haskell

import Data.Char

capitalizeWords = unwords . map capitalizeWord . words
where capitalizeWord [] = []
capitalizeWord (c:cs) = toUpper c : map toLower cs

Numbers

Mathematical

Find the distance between two points

python

# problem description doesn't say 2D points ;)
from math import sqrt
print sqrt(sum((x-y)**2 for x,y in zip(a, b)))

from math import hypot
print hypot(x2-x1, y2-y1)

fsharp

let distance' = distance (34, 78) (67, -45)
printfn "%3.2f" distance'

fantom

px1 := 34.0f; py1 := 78.0f; px2 := 67.0f; py2 := -45.0f
distance := |Float x1, Float y1, Float x2, Float y2 -> Float|
{ ((x2-x1).pow(2.0f) + (y2-y1).pow(2.0f)).sqrt }

distance(px1, py1, px2, py2)

groovy

distance = distance(x1, y1, x2, y2)

distance = sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1))

haskell

data Floating n => Point2 n = Point2 n n

distance :: Floating n => Point2 n -> Point2 n -> n
distance (Point2 x1 y1) (Point2 x2 y2) = sqrt (x'*x' + y'*y')
where
x' = x1 - x2
y' = y1 - y2

-- > distance (Point2 5 10) (Point2 3 5)
-- 5.385...
-- > distance (Point2 1 1) (Point2 2 2)
-- 1.414...

Output

Zero pad a number

Given the number 42, pad it to 8 characters like 00000042

python

"%08d" % 42

fsharp

printfn "%08d" 42

let formatted = sprintf "%08d" 42
printfn "%s" formatted

let buffer = new StringBuilder()
Printf.bprintf buffer "%08d" 42
printfn "%s" (buffer.ToString())

let formatted = String.Format("{0,8:D8}", 42)
Console.WriteLine(formatted)

let formatted = Convert.ToString(42).PadLeft(8, '0')
Console.WriteLine(formatted)

fantom

formatted := 42.toStr.padl(8, '0')

formatted := 42.toLocale("00000000")

groovy

formatted = new DecimalFormat('00000000').format(42)

formatted = 42.toString().padLeft(8, '0')

// to stdout
printf "%08d\n", 42
// to a string
formatted = sprintf("%08d", 42)

formatted = String.format("%08d", 42)

haskell

import Text.Printf

printf "%08d" 42

Right Space pad a number

Given the number 1024 right pad it to 6 characters "1024 "

python

"%-6s" % 1024

str(1024).rjust(6)

'{0: <6}'.format(1024)

fsharp

printfn "%-6d" 1024

let formatted = String.Format("{0,-6:D}", 1024)
Console.WriteLine(formatted)

let formatted = Convert.ToString(1024).PadRight(6)
Console.WriteLine(formatted)

fantom

formatted := 1024.toStr.padr(6)

groovy

println 1024.toString().padRight(6)

formatted = sprintf("%-6d", 1024)

haskell

let s = show 1024
p = 6
in s ++ (replicate (p - length s) ' ')

import Text.Printf

main = do
putStrLn $ printf "%-6d" (1024::Int)

Format a decimal number

Format the number 7/8 as a decimal with 2 places: 0.88

python

"%.2f" % (7 / 8.0)

round(7./8., 2)

fsharp

printfn "%3.2f" (0.7 / 0.8)

let formatted = String.Format("{0,3:F2}", (0.7 / 0.8))
Console.WriteLine(formatted)

fantom

formatted := (7.0/8.0).toLocale("0.00")

groovy

def result = 7/8
println result.round(new MathContext(2))

def result = 7/8
printf "%.2g", result

new Double(7/8).round(2)

haskell

import Text.Printf

printf "%3.2f" (7/8)

main = putStrLn $ Numeric.showFFloat (Just 2) (7/8) ""

Left Space pad a number

Given the number 73 left pad it to 10 characters " 73"

python

"%10s" % 73

fsharp

let formatted = sprintf "%10d" 73
printfn "%s" formatted

let formatted = String.Format("{0,10:D}", 73)
Console.WriteLine(formatted)

let formatted = Convert.ToString(73).PadLeft(10)
Console.WriteLine(formatted)

fantom

formatted := 73.toStr.padl(10)

groovy

println 73.toString().padLeft(10)

printf "%10d\n", 73

haskell

import Text.Printf

formatted :: String
formatted = printf "%10d" 73

Random

Generate a random integer in a given range

Produce a random integer between 100 and 200 inclusive

python

import random
random.randint(100, 200)

# uses best entropy source available (e.g. /dev/urandom, CryptGenRandom, ...)

import random
print random.SystemRandom().randint(100,200)

fsharp

let rnd = new Random()
let rndInt = rnd.Next(100, 201)

fantom

r := Int.random(100..200)

groovy

random = new Random()
randomInt = random.nextInt(200-100+1)+100

haskell

import System.Random

randInRange :: Int -> Int -> IO Int
randInRange a b = getStdRandom $ randomR (a, b)

main = randInRange 100 200 >>= print

import System.Random

main = randomRIO (1,100) >>= print

Generate a repeatable random number sequence

Initialise a random number generator with a seed and generate five decimal values. Reset the seed and produce the same values.

python

import random

random.seed(12345)
list1 = [random.randint(1,10) for x in range(5)]

random.seed(12345)
list2 = [random.randint(1,10) for x in range(5)]

assert(list1==list2)

fsharp

let (seed, lb, ub) = (12345, 100, 200)

let mutable rnd = new Random(seed)
for i = 1 to 5 do printf "%d " (rnd.Next(lb, ub + 1)) done ; printfn ""

rnd <- new Random(seed)
for i = 1 to 5 do printf "%d " (rnd.Next(lb, ub + 1)) done ; printfn ""

fantom

rand := Random.makeSeeded(12345)
first := Int[,].fill(0,5).map { rand.next(100..200) }

rand2 := Random.makeSeeded(12345)
second := Int[,].fill(0,5).map { rand2.next(100..200) }

groovy

random = new Random(12345)
orig = (1..5).collect { random.nextInt(200-100+1)+100 }
random = new Random(12345)
repeat = (1..5).collect { random.nextInt(200-100+1)+100 }
assert orig == repeat

haskell

import System.Random
import Control.Monad (forM_)

main = do
printRands
printRands

where printRands = forM_ [1..5] (\i -> print (randInt i))
randInt i = fst $ randomR (100, 200) (mkStdGen i) :: Int

import System.Random

gen1 = mkStdGen 12345
gen2 = mkStdGen 12345

main = do
print $ take 5 (randoms gen1 :: [Float])
print $ take 5 (randoms gen2 :: [Float])

Regex

Matching

Check if a string matches a regular expression

Display "ok" if "Hello" matches /[A-Z][a-z]+/

python

found = re.match(r'[A-Z][a-z]+', 'Hello')
if found:
print 'ok'

fsharp

if (Regex.IsMatch("Hello", "[A-Z][a-z]+")) then printfn "ok"

fantom

if (Regex<|[A-Z][a-z]+|>.matches("Hello"))
echo("ok")

groovy

if ("Hello" =~ /[A-Z][a-z]+/) println 'ok'

if ("Hello".find(/[A-Z][a-z]+/)) println 'ok'

// with precompiled regex
def regex = ~/[A-Z][a-z]+/
if ("Hello".find(regex)) println 'ok'

// with precompiled regex
def regex = ~/[A-Z][a-z]+/
if ("Hello".matches(regex)) println 'ok'

if ("Hello".matches("[A-Z][a-z]+")) println 'ok'

haskell

import Text.Regex.Posix
main = if "Hello" =~ "[A-Z][a-z]+" then putStrLn "OK" else return ()

Check if a string matches with groups

Display "two" if "one two three" matches /one (.*) three/

python

match = re.match(r'one (.*) three', 'one two three')
if match:
print match.group(1)

fsharp

let regmatch = (Regex.Match("one two three", "one (.*) three"))
if regmatch.Success then (printfn "%s" (regmatch.Groups.[1].Captures.[0].ToString()))

fantom

m := Regex<|one (.*) three|>.matcher("one two three")
if (m.matches)
echo("${m.group(1)}")

groovy

matcher = ("one two three" =~ /one (.*) three/)
if (matcher) println matcher[0][1]

match = "one two three".find("one (.*) three") { it[1] }
if (match) println match

haskell

import Text.Regex
main = case matchRegex (mkRegex "one (.*) three") "one two three" of
Nothing -> return ()
Just (x:_) -> putStrLn x

Searching

Check if a string contains a match to a regular expression

Display "ok" if "abc 123 @#$" matches /\d+/

python

found = re.search(r'\d+', 'abc 123 @#$')
if found:
print 'ok'

fsharp

if (Regex.IsMatch("abc 123 @#$", "\\d+")) then printfn "ok"

fantom

m := Regex<|\d+|>.matcher("abc 123 @#\$")
if (m.find)
echo("ok")

groovy

if ('abc 123 @#$' =~ /\d+/) println 'ok'

if ('abc 123 @#$'.find(/\d+/)) println 'ok'

haskell

import Text.Regex
main = case matchRegex (mkRegex "\d+") "abc 123 @#$" of
Nothing -> putStrLn "not ok"
Just _ -> putStrLn "ok"

Loop through a string matching a regex and performing an action for each match

Create a list [fish1,cow3,boat4] when matching "(fish):1 sausage (cow):3 tree (boat):4" with regex /$(\w+)$:(\d+)/

python

map(''.join, re.findall(r"$(\w+)$:(\d+)", "(fish):1 sausage (cow):3 tree (boat):4"))
--------------------------------------------------------------------------
(''.join(m.groups()) for m in re.finditer(r"$(\w+)$:(\d+)", "(fish):1 sausage (cow):3 tree (boat):4"))

fsharp

let list = new ResizeArray<string>()
let mutable regmatch = (Regex.Match("(fish):1 sausage (cow):3 tree (boat):4", "\$(\\w+)\$:(\\d+)"))

while regmatch.Success do
list.Add(regmatch.Groups.[1].Captures.[0].ToString() ^ regmatch.Groups.[2].Captures.[0].ToString())
regmatch <- regmatch.NextMatch()
done

for word in list do printfn "%s" word done

// A solution without mutation:
let results =
Regex.Matches("(fish):1 sausage (cow):3 tree (boat):4", "\$(\\w+)\$:(\\d+)")
|> Seq.cast
|> Seq.map (fun (regmatch: Match) ->
regmatch.Groups.[1].Captures.[0].ToString() + regmatch.Groups.[2].Captures.[0].ToString()
)
|> List.ofSeq

fantom

m := Regex<|$(\w+)$:(\d+)|>.matcher(s)
list := Str[,]
while (m.find) { list.add("${m.group(1)}${m.group(2)}") }

groovy

list = (text =~ /$(\w+)$:(\d+)/).collect{ it[1] + it[2] }

list = []
text.eachMatch(/$(\w+)$:(\d+)/){
list << it[1] + it[2]
}

list = []
text.eachMatch(/$(\w+)$:(\d+)/){ m, name, number ->
list << "$name$number"
}

list = (text =~ /$(\w+)$:(\d+)/).collect{ all, name, num -> "$name$num" }

list = text.findAll(regex){ _, name, num -> "$name$num" }

list = text.findAll(regex){ it[1] + it[2] }

haskell

import Text.Regex

getParenNum s = case matchRegexAll re s of
Nothing -> []
Just (_,_,after,[word,num]) -> (word ++ num):getParenNum after where
re = mkRegex "\$(\\w+)\$:([[:digit:]]+)"

main = putStrLn (show (getParenNum "(fish):1 sausage (cow):3 tree (boat):4"))

Replacing

Replace the first regex match in a string with a static string

Transform "Red Green Blue" into "R*d Green Blue" by replacing /e/ with "*"

python

print re.sub(r'e', '*', 'Red Green Blue', 1)

fsharp

let replaced = ((new Regex("e")).Replace("Red Green Blue", "*", 1))
printfn "%s" replaced

fantom

replaced := Regex<|e|>.split("Red Green Blue",2).join("*")

groovy

replaced = "Red Green Blue".replaceFirst("e", "*")

Replace all regex matches in a string with a static string

Transform "She sells sea shells" into "She X X shells" by replacing /se\w+/ with "X"

python

transformed = re.sub(r'se\w+', 'X', 'She sells sea shells')

fsharp

let replaced = ((new Regex("se\\w+")).Replace("She sells sea shells", "X"))
printfn "%s" replaced

fantom

replaced := Regex<|se\w+|>.split("She sells sea shells").join("X")

groovy

replaced = text.replaceAll(/se\w+/,"X")

Replace all regex matches in a string with a dynamic string

Transform "The {Quick} Brown {Fox}" into "The kciuQ Brown xoF" by reversing words in braces using the regex /\{(\w+)\}/.

python

transformed = re.sub(r'\{(\w+)\}',
lambda match: match.group(1)[::-1],
'The {Quick} Brown {Fox}')

fsharp

open System
open System.Text.RegularExpressions
let reverseMatch (m:Match) =
String(m.Groups.[1].Value.ToCharArray() |> Array.rev)
let output = Regex.Replace("The {Quick} Brown {Fox}", @"\{(\w+)\}", reverseMatch)

fantom

s := "The {Quick} Brown {Fox}"
m := Regex<|\{(\w+)\}|>.matcher(s)
buf := StrBuf(s.size)
last := 0
while (m.find)
{
buf.add(s[last..m.start-1]).add(m.group(1).reverse)
last = m.end
}
buf.add(s[last..-1])
replaced := buf.toStr

groovy

replaced = "The {Quick} Brown {Fox}".replaceAll(/\{(\w+)\}/, { full, word -> word.reverse() } )

Lists

Declaration

Define an empty list

Assign the variable "list" to a list with no elements

python

list = []

fsharp

let list = []

let list = List.empty

let list = new Generic.List<string>()

let list = new Generic.LinkedList<string>()

fantom

list := [,]

groovy

list = []

// if a special kind of list is required
list = new LinkedList() // java style
LinkedList list = [] // statically typed
// using 'as' operator
list = [] as java.util.concurrent.CopyOnWriteArrayList

haskell

let list = []

Define a static list

Define the list [One, Two, Three, Four, Five]

python

list = ['One', 'Two', 'Three', 'Four', 'Five']
print list

fsharp

let list = ["One"; "Two"; "Three"; "Four"; "Five"]

let list = (new Generic.LinkedList<string>([|"One"; "Two"; "Three"; "Four"; "Five"|]))

let list = (new Generic.LinkedList<string>())

list.AddFirst("One") ; list.AddLast("Five") ; list.AddBefore(list.Find("Five"), "Four")
list.AddAfter(list.Find("One"), "Two") ; list.AddAfter(list.Find("Two"), "Three")

let list = (new Generic.List<string>())

[|"One"; "Two"; "Three"; "Four"; "Five"|] |> Array.iter (fun x -> list.Add(x))

fantom

list := ["One", "Two", "Three", "Four", "Five"]

groovy

list = ['One', 'Two', 'Three', 'Four', 'Five']

// other variations
List<String> numbers1 = ['One', 'Two', 'Three', 'Four', 'Five']
String[] numbers2 = ['One', 'Two', 'Three', 'Four', 'Five']
numbers3 = new LinkedList(['One', 'Two', 'Three', 'Four', 'Five'])
numbers4 = ['One', 'Two', 'Three', 'Four', 'Five'] as Stack // Groovy 1.6+

haskell

let a = ["One", "Two", "Three", "Four", "Five"]

Output

Join the elements of a list, separated by commas

Given the list [Apple, Banana, Carrot] produce "Apple, Banana, Carrot"

python

print ", ".join(['Apple', 'Banana', 'Carrot'])

fsharp

let result = String.Join(", ", [|"Apple"; "Banana"; "Carrot"|])

let result = (List.fold_left (fun acc item -> acc ^ (", " ^ item)) (List.hd fruit) (List.tl fruit))

let result = (List.fold_left (fun (acc : StringBuilder) (item : string) -> acc.Append(", ").Append(item)) (new StringBuilder(List.hd fruit)) (List.tl fruit)).ToString()

fantom

["Apple", "Banana", "Carrot"].join(", ")

groovy

string = fruit.join(', ')

string = fruit.toString()[1..-2]

haskell

import Data.List

let join = intercalate ", " ["Apple", "Banana", "Carrot"]

Join the elements of a list, in correct english

Create a function join that takes a List and produces a string containing an english language concatenation of the list. It should work with the following examples:
join([Apple, Banana, Carrot]) = "Apple, Banana, and Carrot"
join([One, Two]) = "One and Two"
join([Lonely]) = "Lonely"
join([]) = ""

python

def join(*x):
if len(x) <= 2:
return ' and '.join(x)
else:
return ', '.join(x[:-1] + ('and ' + x[-1],))

if __name__ == "__main__":
assert join("Apple", "Banana", "Carrot") == "Apple, Banana, and Carrot"
assert join("One", "Two") == "One and Two"
assert join("Lonely") == "Lonely"
assert join(*[]) == ""

fsharp

fantom

join := |List list -> Str|
{
switch(list.size)
{
case 0: return ""
case 1: return list[0]
case 2: return list.join(" and ")
default: return list[0..-2].join(", ") + ", and " + list[-1]
}
}

echo(join(["Apple", "Banana", "Carrot"]))
echo(join(["One", "Two"]))
echo(join(["Lonely"]))
echo(join([,]))

groovy

def join(list) {
if (!list) return ''
switch(list.size()) {
case 1:
return list[0]
case 2:
return list.join(' and ')
default:
return list[0..-2].join(', ') + ', and ' + list[-1]
}
}

ArrayList.metaClass.joinEng = { ->
def closureMap = [0: { -> delegate.join(' and ')}, 1 : {-> delegate.join(' and ')}].withDefault { k -> { -> delegate[0..-2].join(', ') + ', and ' + delegate[-1] } }
if (delegate.size()) closureMap[delegate.size()-1].call()
else ""
}

assert ["a"].joinEng() == "a"
assert ["a", "b"].joinEng() == "a and b"
assert ["a", "b", "c"].joinEng() == "a, b, and c"
assert [].joinEng() == ""

haskell

join [] = ""
join [x] = x
join [x,y] = x ++ " and " ++ y
join [x,y,z] = x ++ ", " ++ y ++ ", and " ++ z
join (x:xs) = x ++ ", " ++ join xs

Produce the combinations from two lists

Given two lists, produce the list of tuples formed by taking the combinations from the individual lists. E.g. given the letters ["a", "b", "c"] and the numbers [4, 5], produce the list: [["a", 4], ["b", 4], ["c", 4], ["a", 5], ["b", 5], ["c", 5]]

python

[(x, y) for y in [1,2] for x in ['a','b','c']]

import itertools
[x for x in itertools.product(["a", "b", "c"], [4, 5])]

fsharp

let combinations = (List.fold_left (fun acc number -> acc @ (List.map (fun letter -> (letter, number)) letters)) [] numbers)

let combinations aa bb =
aa
|> List.map (fun a -> bb |> List.map (fun b -> (a, b)))
|> List.concat

fantom

[4,5].each |Int i| { ["a","b","c"].each |Str s| { r.add([i,s]) } }

groovy

letters = ['a', 'b', 'c']
numbers = [4, 5]
combos = [letters, numbers].combinations()

haskell

comb :: [(String, Int)]
comb = do
b <- [4,5]
a <- ["a","b","c"]
return (a,b)

main = mapM_ print comb

comb :: [(String, Int)]
comb = [(a, b) | b <- [4,5], a <- ["a","b","c"]]

main = print comb

From a List Produce a List of Duplicate Entries

Taking a list:
["andrew", "bob", "chris", "bob"]

Write the code to produce a list of duplicates in the list:
["bob"]

python

import itertools
input = ["andrew", "bob", "chris", "bob"]
input.sort()
output = [k for k, g in itertools.groupby(input, lambda x: x) if len(list(g)) > 1]

fsharp

["andrew"; "bob"; "chris"; "bob"]
|> Seq.countBy id
|> Seq.filter (fun (k,n) -> n > 1)
|> Seq.map fst
|> Seq.toList

fantom

nameCounts := Str:Int[:] { def = 0 }
["andrew", "bob", "chris", "bob"].each |Str v| { nameCounts[v]++ }
results := nameCounts.findAll |Int v, Str k->Bool| { v > 1 }.keys
echo(results.join(","))

groovy

def input = ["andrew", "bob", "chris", "bob"]

def output = input.findAll{input.count(it)>1}.unique()

assert output == ["bob"]

haskell

import Data.List

input = ["andrew", "bob", "chris", "bob"]
output = [ head l | l <- group (sort input), length l > 1]

Access

Fetch an element of a list by index

Given the list [One, Two, Three, Four, Five], fetch the third element ('Three')

python

list = ['One', 'Two', 'Three', 'Four', 'Five']
list[2]

fsharp

let result = List.nth ["One"; "Two"; "Three"; "Four"; "Five"] 2

fantom

["One", "Two", "Three", "Four", "Five"][2]

["One", "Two", "Three", "Four", "Five"].get(2)

groovy

list = ['One', 'Two', 'Three', 'Four', 'Five']
result = list[2] // index starts at 0

haskell

let a = [1..5]
let b = a !! 2
print b

Fetch the last element of a list

Given the list [Red, Green, Blue], access the last element ('Blue')

python

list = ['Red', 'Green', 'Blue']
list[-1]

fsharp

let last list =
let rec last' list' =
match list' with
| [x] -> x
| x :: xs -> last' xs
if List.is_empty list then failwith "empty list" else last' list

// ------

let result = last list

let result = (List.nth list ((List.length list) - 1))

let result = (List.hd (List.rev list))

fantom

["Red", "Green", "Blue"][-1]

["One", "Two", "Three", "Four", "Five"].last

groovy

list = ['Red', 'Green', 'Blue']
result = list[-1]

haskell

last ["Red", "Green", "Blue"]

Find the common items in two lists

Given two lists, find the common items. E.g. given beans = ['broad', 'mung', 'black', 'red', 'white'] and colors = ['black', 'red', 'blue', 'green'], what are the bean varieties that are also color names?

python

beans = ['broad', 'mung', 'black', 'red', 'white']
colors = ['black', 'red', 'blue', 'green']

common = [b for b in beans if b in colors]

beans = ['broad', 'mung', 'black', 'red', 'white']
colors = ['black', 'red', 'blue', 'green']

common = set(beans) & set(colors)

fsharp

let beans = (Set.of_list ["broad"; "mung"; "black"; "red"; "white"])
let colors = (Set.of_list ["black"; "red"; "blue"; "green"])
let common = (Set.intersect beans colors)

let beans = Set ["broad"; "mung"; "black"; "red"; "white"]
let colors = Set ["black"; "red"; "blue"; "green"]
let common = Set.intersect beans colors

// Iterates elements of
// list1 across Elements of list2 returning a list of string options
// as generated by List.tryFind
let findCommon(list1 : 'a list, list2 : 'a list) : 'a list =
list1 |> List.map(fun y -> list2 |> List.tryFind(fun x -> y = x))
// Iterates elements of string option list generated above
// returning a string list containing common elements of List1 and List2
|> List.fold(fun acc x -> if x <> None then x.Value::acc else acc) []
// reverse order of list (can't seem to make List.foldBack work for this
|> List.rev

let beans = ["broad"; "mung"; "black"; "red"; "white"]
let colors = ["black"; "red"; "blue"; "green"]
printfn "%A" (findCommon(beans, colors)) ;;

fantom

beans := ["broad", "mung", "black", "red", "white"]
colors := ["black", "red", "blue", "green"]
echo(beans.intersection(colors))

groovy

beans = ['broad', 'mung', 'black', 'red', 'white']
colors = ['black', 'red', 'blue', 'green']
common = beans.intersect(colors)
assert common == ['black', 'red']

haskell

import Data.List

beans = ["broad", "mung", "black", "red", "white"]
colors = ["black", "red", "blue", "green"]

main = print (intersect beans colors)

Display the unique items in a list

Display the unique items in a list, e.g. given ages = [18, 16, 17, 18, 16, 19, 14, 17, 19, 18], display the unique elements, i.e. with duplicates removed.

python

ages = [18, 16, 17, 18, 16, 19, 14, 17, 19, 18]

unique_ages = list(set(ages))

fsharp

(Set.ofList [18; 16; 17; 18; 16; 19; 14; 17; 19; 18]) |> Set.iter (fun age -> printf "%d, " age)

fantom

uniqueAges := [18, 16, 17, 18, 16, 19, 14, 17, 19, 18].unique
echo(uniqueAges)

groovy

ages = [18, 16, 17, 18, 16, 19, 14, 17, 19, 18]
println ages.unique()

ages = [18, 16, 17, 18, 16, 19, 14, 17, 19, 18]
unique = ages as Set
println unique

haskell

import Data.List

ages = [18, 16, 17, 18, 16, 19, 14, 17, 19, 18]

uniqueAges = nub ages

Modification

Remove an element from a list by index

Given the list [Apple, Banana, Carrot], remove the first element to produce the list [Banana, Carrot]

python

myList = ['Apple', 'Banana', 'Carrot']
print myList
del myList[0]
# or
myList.pop(0) # returns 'Apple'
print myList

fsharp

let split_at list n =
let rec split_at' list' n' left right =
match list' with
| [] -> (List.rev left, List.rev right)
| x :: xs -> if n' <= n then split_at' xs (n' + 1) (x :: left) right else split_at' xs (n' + 1) left (x :: right)
split_at' list 0 [] []

// ------

let (_, right) = split_at fruit 0

let drop list n =
if n <= 0 then
list
else
let (_, right) = split_at list (n - 1)
right

// ------

let result = (drop fruit 1)

fantom

list := ["Apple", "Banana", "Carrot"]
list.removeAt(0)

groovy

// to produce a new list
newlist = list.tail() // for 'Apple' at start
newlist = list - 'Apple' // for 'Apple' anywhere

// mutate original list
list.remove(0)

haskell

deleteNth n xs | n > 0 = take (n-1) xs ++ drop n xs

main = print $ deleteNth 1 [1..3]

fruit :: [String]
fruit = ["Apple", "Banana", "Carrot"]

main :: IO ()
main = putStrLn $ show $ tail fruit

Remove the last element of a list

python

myList = ['Apple', 'Banana', 'Carrot']
myList.pop()

fsharp

let take list n =
if n <= 0 then
list
else
let (left, _) = split_at list (n - 1)
left

// ------

let result = (take fruit ((List.length fruit) - 1))

let but_last list =
let rec but_last' list' acc =
match list' with
| [x] -> List.rev acc
| x :: xs -> but_last' xs (x :: acc)
if List.is_empty list then [] else but_last' list []

// ------

let result = (but_last fruit)

fantom

list := ["Apple", "Banana", "Carrot"]
list.removeAt(-1)

list := ["Apple", "Banana", "Carrot"]¨
list.pop

groovy

list = ['Apple', 'Banana', 'Carrot']
// to produce a new list
newlist = list[0,1]
// to modify original list
list.remove(2)

haskell

ages = [1,2,3,4]

init ages

Rotate a list

Given a list ["apple", "orange", "grapes", "bananas"], rotate it by removing the first item and placing it on the end to yield ["orange", "grapes", "bananas", "apple"]

python

l = ["apple", "orange", "grapes", "bananas"]
first, l = l[0], l[1:] + l[:1]

fruit = ['apple', 'orange', 'grapes', 'bananas']
fruit.append(fruit.pop(0))

fsharp

let rotate list n =
if n <= 0 then
list
else
let (left, right) = split_at list (n - 1)
right @ left

// ------

let result = (rotate fruit 1)

fantom

list := ["apple", "orange", "grapes", "bananas"]
list.add(list.removeAt(0))

groovy

first = items.head()
items = items.tail() + first

items = items[1..-1] + items[0]

items = items + items.remove(0)

haskell

main = print $ rotate ["apple", "orange", "grapes", "bananas"]

rotate xs | length xs < 2 = xs
| otherwise = tail xs ++ [head xs]

Manipulation

Gather together corresponding elements from multiple lists

Given several lists, gather together the first element from every list, the second element from every list, and so on for all corresponding index values in the lists. E.g. for these three lists, first = ['Bruce', 'Tommy Lee', 'Bruce'], last = ['Willis', 'Jones', 'Lee'], years = [1955, 1946, 1940] the result should produce 3 actors. The middle actor should be Tommy Lee Jones.

python

first = ['Bruce', 'Tommy Lee', 'Bruce']
last = ['Willis', 'Jones', 'Lee']
years = [1955, 1946, 1940]

actors = zip(first, last, years)

assert len(actors) == 3
assert actors[1] == ('Tommy Lee', 'Jones', 1946)

fsharp

let result = (List.zip3 first last years)

fantom

r := [,]
first.size.times |Int i| { r.add([first[i], last[i], years[i]]) }

echo(r)

groovy

first = ['Bruce', 'Tommy Lee', 'Bruce']
last = ['Willis', 'Jones', 'Lee']
years = [1955, 1946, 1940]
actors = [first, last, years].transpose()
assert actors.size() == 3
assert actors[1] == ['Tommy Lee', 'Jones', 1946]

haskell

import Prelude hiding (last)

first = ["Bruce", "Tommy Lee", "Bruce"]
last = ["Willis", "Jones", "Lee"]
years = [1955, 1946, 1940]

actors = zip3 first last years

List Combinations

Given two source lists (or sets), generate a list (or set) of all the pairs derived by combining elements from the individual lists (sets). E.g. given suites = ['H', 'D', 'C', 'S'] and faces = ['2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K', 'A'], generate the deck of 52 cards, confirm the deck size and check it contains an expected card, say 'Ace of Hearts'.

python

suites = ('H', 'D', 'C', 'S')
faces = ('2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K', 'A')
deck = [(face,suite) for suite in suites for face in faces]
assert len(deck) == 52
assert ('A', 'H') in deck

fsharp

let cards = (List.fold_left (fun acc suite -> acc @ (List.map (fun face -> (suite, face)) faces)) [] suites)

printfn "Deck has %d cards" (List.length cards)
printfn "%s" (if (List.exists (fun e -> e = ("h", "A")) cards) then "Deck contains 'Ace of Hearts'" ; else "'Ace of Hearts' not in deck")

let product (set1 : List<'a>) (set2 : List<'a>) : List<'a * 'a> =
let p = new ResizeArray<'a * 'a>()
for e1 in set1 do for e2 in set2 do p.Add(e1, e2) done done
Array.to_list (p.ToArray())

// ------

let cards = product suites faces

printfn "Deck has %d cards" (List.length cards)
printfn "%s" (if (List.exists (fun e -> e = ("h", "A")) cards) then "Deck contains 'Ace of Hearts'" ; else "'Ace of Hearts' not in deck")

fantom

r := [,]
["2","3","4","5","6","7","8","9","10","J","Q","K","A"].each |Str c|
{ ["H","D","C","S"].each |Str s| { r.add([c,s]) } }

q := ["A","H"]
result := r.contains(q)
echo("Deck size=${r.size}, contains $q? -> $result")

groovy

faces = ['2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K', 'A']
suites = ['H', 'D', 'C', 'S']
deck = [faces, suites].combinations()
assert deck.size() == 52
assert ['A', 'H'] in deck

haskell

import Data.List

suites = ["H", "D", "C", "S"]
faces = ["2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A"]

main = do
let cards = [(s,f) | s <- suites, f <- faces ]
print (length cards)
print $ hasCard ("H", "A") "Ace of Hearts" cards
where hasCard t name cards = (if elem t cards then "Contains "
else "Does not contain") ++ name

Perform an operation on every item of a list

Perform an operation on every item of a list, e.g.
for the list ["ox", "cat", "deer", "whale"] calculate
the list of sizes of the strings, e.g. [2, 3, 4, 5]

python

print map(lambda x: len(x), ["ox", "cat", "deer", "whale"])

print [len(x) for x in ['ox', 'cat', 'deer', 'whale']]

fsharp

let lengths = List.map String.length ["ox"; "cat"; "deer"; "whale"]

fantom

["ox", "cat", "deer", "whale"].map { it.size }

groovy

animals = ["ox", "cat", "deer", "whale"]
assert animals*.size() == [2, 3, 4, 5]

haskell

map length ["ox", "cat", "deer", "whale"]

Split a list of things into numbers and non-numbers

Given a list that might contain e.g. a string, an integer, a float and a date,
split the list into numbers and non-numbers.

python

import re
data = '34234aff340980adf0e0fa0fefl' ## or ''.join(array)

nonDigits = re.findall(re.compile('\D'), data)
digits = re.findall(re.compile('\d'), data)

fsharp

fantom

things := ["hello", 25, 3.14, Time.now]
numbers := things.findType(Num#)
nonNumbers := things.exclude { numbers.contains(it) }

groovy

now = new Date()
things = ["hello", 25, 3.14, now]
(numbers, others) = things.split{ it instanceof Number }
assert numbers == [25, 3.14]
assert others == ["hello", now]

haskell

import Data.List (partition)

type Date = String
data Things = TS String | TI Int | TD Date
deriving Show

main = do
let myList = [TI 1, TI 23, TS "Joe", TD "23/04/2009"]
print $ partition isNumber myList

where isNumber (TS _) = False
isNumber (TI _) = True
isNumber (TD _) = False

Testing

Test if a condition holds for all items of a list

Given a list, test if a certain logical condition (i.e. predicate) holds for all items of the list.

python

all(x > 1 for x in [2,3,4])

fsharp

let rec IsAll predicate source =
let mutable acc = true
for e in source do
acc <- acc && (predicate e)
acc

fantom

echo([2,3,4].all{ it>1 })

groovy

[2,3,4].every{it > 1}

haskell

all (> 1) [2, 3, 4]

Test if a condition holds for any items of a list

Given a list, test if a certain logical condition (i.e. predicate) holds for any items of the list.

python

any(x > 3 for x in [2, 3, 4])

fsharp

let rec IsAny predicate source =
match source with
| [] -> false
| h::t ->
if (predicate h) then true
else (IsAny predicate t )

fantom

echo([2,3,4].any{ it==4 })

groovy

[2,3,4].any{it > 3}

haskell

any (> 1) [1, 2, 3]

Maps

Declaration

Define an empty map

python

map = {}

fsharp

let map = Map.empty

let map = new Generic.Dictionary<string, string>()

let map = new Hashtable()

fantom

map := [:]

groovy

def map = [:]

Map map = new HashMap();

haskell

import qualified Data.Map as M

emptyMap = M.empty

Define an unmodifiable empty map

python

import collections
EmptyDict = collections.namedtuple("EmptyDict", "")
e = EmptyDict()

fsharp

// Most native fsharp data structures are immutable - updating a 'map' sees a modified copy created
let map = Map.empty

fantom

map := [:].ro

groovy

empty = Collections.EMPTY_MAP

map = [:].asImmutable()

def empty = MapUtils.EMPTY_SORTED_MAP

def empty = ImmutableMap.of()

haskell

import qualified Data.Map as Map

output :: Map.Map k v
output = Map.empty

Define an initial map

Define the map {circle:1, triangle:3, square:4}

python

shapes = {'circle': 1, 'square': 4, 'triangle': 2}

fsharp

let shapes = Map.ofList [("circle", 1); ("triangle", 3); ("square", 4)]

let shapes = Map.empty.Add("circle", 1).Add("triangle", 3).Add("square", 4)

let shapes = new Generic.Dictionary<string, int>()
shapes.Add("circle", 1)
shapes.Add("triangle", 3)
shapes.Add("square", 4)

let shapes = Map [("circle", 1); ("triangle", 3); ("square", 4)]

fantom

map := ["circle":1, "triangle":2, "square":4]

groovy

shapes = [circle:1, triangle:3, square:4]

// if you require a specific type of map ...
LinkedHashMap shapes1 = [circle:1, triangle:3, square:4]
Properties shapes2 = [circle:1, triangle:3, square:4]
TreeMap shapes3 = [circle:1, triangle:3, square:4]
shapes4 = [circle:1, triangle:3, square:4] as ConcurrentHashMap // as variation

haskell

import qualified Data.Map as M

initialMap = M.fromList [("circle", 1), ("triangle", 3), ("square", 4)]

Access

Check if a key exists in a map

Given a map pets {joe:cat,mary:turtle,bill:canary} print "ok" if an pet exists for "mary"

python

pets = dict(joe='cat', mary='turtle', bill='canary')
if ("mary" in pets) print "ok"

fsharp

if (Map.mem "mary" pets) then printfn "ok"

if pets.ContainsKey("mary") then printfn "ok"

fantom

map := ["joe":"cat", "mary":"turtle", "bill":"canary"]
if (map.containsKey("mary")) echo("ok")

groovy

pets = [joe:'cat', mary:'turtle', bill:'canary']
if(pets.containsKey('mary')) println 'ok'

pets = [joe:'cat', mary:'turtle', bill:'canary']
if(pets.mary) println 'ok'

haskell

import qualified Data.Map as M
import Control.Monad (when)

pets = M.fromList [("joe", "cat"), ("mary", "turtle"), ("bill", "canary")]

checkMary = when (M.member "mary" pets) (print "ok")

Retrieve a value from a map

Given a map pets {joe:cat,mary:turtle,bill:canary} print the pet for "joe" ("cat")

python

print pets['joe']

fsharp

if (Map.mem "joe" pets) then printfn "%s" (Map.find "joe" pets)

if (pets |> Map.exists (fun key _ -> key = "joe")) then printfn "%s" (Map.find "joe" pets)

let key = "joe"
match (pets |> Map.tryfind key) with
| Some(value) -> printfn "%s" value
| None -> printfn "Key %s not found" key

if pets.ContainsKey("joe") then printfn "%s" pets.["joe"]

if pets.ContainsKey("joe") then printfn "%s" (pets.["joe"] :?> string)

fantom

map := ["joe":"cat", "mary":"turtle", "bill":"canary"]
pet := map["joe"]
echo("pet=$pet")

groovy

pets = [joe:'cat', mary:'turtle', bill:'canary']
assert pets['joe'] == 'cat'

assert pets.joe == 'cat'

haskell

import qualified Data.Map as M

pets = M.fromList [("joe", "cat"), ("mary", "turtle"), ("bill", "canary")]
retrieve = print $ M.findWithDefault "Not found" "joe" pets

Add an entry to a map

Given an empty pets map, add the mapping from "rob" to "dog"

python

pets['rob'] = 'dog'

fsharp

pets <- (Map.add "rob" "dog" pets)

pets.Add("rob", "dog")

fantom

map["rob"] = "dog"

groovy

pets['rob'] = 'dog'

pets.rob = 'dog'

pets.put('rob', 'dog')

haskell

import qualified Data.Map as M

pets = M.insert "rob" "dog" M.empty

Remove an entry from a map

Given a map pets {joe:cat,mary:turtle,bill:canary} remove the mapping for "bill" and print "canary"

python

print pets.pop('bill')

fsharp

let key = "bill"
match (pets |> Map.tryFind key) with
| Some(value) -> pets <- (Map.remove key pets) ; printfn "%s : %s removed" key value
| None -> printfn "Key %s not found" key

let key = "bill"
let entry = if (pets.ContainsKey(key)) then Some(pets.[key]) ; else None
pets.Remove(key)

match entry with
| Some(value) -> printfn "%s" value
| None -> printfn "key not found"

fantom

pet := map.remove("bill")
echo ("pet=$pet")

groovy

pets = [joe:'cat', mary:'turtle', bill:'canary']
println pets.remove('bill')

haskell

import qualified Data.Map as M

main = do
let pets = M.fromList [("joe", "cat"), ("mary", "turtle"), ("bill", "canary")]
pets2 = M.delete "bill" pets
print $ maybe "" id (M.lookup "bill" pets)
print pets2

Algorithms

Create a histogram map from a list

Given the list [a,b,a,c,b,b], produce a map {a:2, b:3, c:1} which contains the count of each unique item in the list

python

from collections import defaultdict
h = defaultdict(int)
for k in "abacbb":
h[k] += 1

h = {}
for k in "abacbb":
h[k] = h.setdefault(k, 0) + 1

from collections import Counter
h = Counter("abacbb")
print(h)

fsharp

let histogram = (List.foldLeft (fun (acc : Map<char, int>) (e : char) -> if (Map.mem e acc) then (Map.add e ((Map.find e acc) + 1) acc) ; else (Map.add e 1 acc)) (Map.empty) list)

let histogram list =
let rec histogram' list' dict' =
match list' with
| [] -> dict'
| x :: xs ->
match Map.tryFind x dict' with
| Some(Value) -> histogram' xs (Map.add x (Value + 1) dict')
| None -> histogram' xs (Map.add x 1 dict')
histogram' list Map.empty

// ------

let histogram' = histogram list

let histogram = (List.foldLeft (fun (acc : Generic.Dictionary<char, int>) (e : char) -> (if acc.ContainsKey(e) then acc.[e] <- acc.[e] + 1 ; else acc.Add(e, 1)) ; acc) (new Generic.Dictionary<char, int>()) list)

let histogram =
list
|> Seq.groupBy (fun a -> a)
|> Seq.map(fun (key, elements) -> key, Seq.length elements)
|> Map.ofSeq

fantom

list := ["a","b","a","c","b","b"]
map := [Str:Int][:]
list.each |Str s, Int i| { if(!map.containsKey(s)) map.add(s,1); else map[s] = ++map[s] }
echo (map)

groovy

histogram = [:]
list.each { item ->
if (!histogram.containsKey(item)) histogram[item] = 0
histogram[item]++
}

histogram = [:]
list.each { histogram[it] = (histogram[it] ?: 0) + 1 }

haskell

import Data.List
import qualified Data.Map as Map

histogram :: Ord a => [a] -> Map.Map a Int
histogram xs = Map.fromList [ (head l, length l) | l <- group (sort xs) ]

output :: Map.Map String Int
output = histogram ["a","b","a","c","b","b"]

import Control.Arrow
import Data.List
import qualified Data.Map as Map
import System.Random

histogram :: Ord a => [a] -> Map.Map a Int
histogram = Map.fromList . map (head &&& length) . group . sort

main = print . histogram . take 1000 . randomRs (1::Int, 100) =<< newStdGen

Categorise a list

Given the list [one, two, three, four, five] produce a map {3:[one, two], 4:[four, five], 5:[three]} which sorts elements into map entries based on their length

python

c = defaultdict(list)
for k in ["one", "two", "four", "three", "five"]:
c[len(k)].append(k)

from itertools import groupby
lst = ["one", "two", "four", "three", "five"]
c = dict((k, list(g)) for k,g in
groupby(sorted(lst, key=lambda x: len(x)), key=lambda x: len(x)))
print(c)

fsharp

let catmap = (List.foldLeft (fun (acc : Map<int, List<string> >) (e : string) -> if (Map.mem e.Length acc) then (Map.add e.Length ((Map.find e.Length acc) @ [e]) acc) ; else (Map.add e.Length [e] acc)) (Map.empty) list)

let lengthMap =
["one"; "two"; "three"; "four"; "five"]
|> Seq.groupBy (fun s -> s.Length)
|> Seq.map (fun (length, entries) -> (length, entries |> List.ofSeq))
|> Map.ofSeq

fantom

list := ["one", "two", "three", "four", "five"]
map := [Int:List][:]
list.each { List l := map[it.size] ?: [,]; map[it.size] = l.add(it) }
echo(map)

groovy

map = ['one', 'two', 'three', 'four', 'five'].groupBy{ it.size() }

haskell

import qualified Data.Map as Map

groupInMapBy :: Ord k => (a -> k) -> [a] -> Map.Map k [a]
groupInMapBy f = foldr (\a -> Map.insertWith (++) (f a) [a]) Map.empty

output :: Map.Map Int [String]
output = groupInMapBy length ["one", "two", "three", "four", "five"]

import Data.List (groupBy, sortBy)
import Data.Function (on)

groupInPairsBy :: Ord k => (a -> k) -> [a] -> [(k, [a])]
groupInPairsBy f = map (\xs -> (f (head xs), xs)) .
groupBy ((==) `on` f) . sortBy (compare `on` f)

output :: [(Int, [String])]
output = groupInPairsBy length ["one", "two", "three", "four", "five"]

Structure

Conditionals

Perform an action if a condition is true (IF .. THEN)

Given a variable name, if the value is "Bob", display the string "Hello, Bob!". Perform no action if the name is not equal.

python

if name == 'Bob':
print 'Hello, Bob!'

fsharp

if name = "Bob" then printfn "Hello, %s!" name

name = "Bob" && begin printfn "Hello, %s!" name ; true end

fantom

if (name=="Bob") echo("Hello, Bob!")

groovy

if (name=='Bob')
println "Hello, Bob!"

haskell

name = "Bob"
main = if name == "Bob" then putStrLn "Hello, Bob!" else return ()

Perform different actions depending on a boolean condition (IF .. THEN .. ELSE)

Given a variable age, if the value is greater than 42 display "You are old", otherwise display "You are young"

python

if age > 42:
print 'You are old'
else:
print 'You are young'

print age > 42 and 'You are old' or 'You are young'

fsharp

if age > 42 then printfn "You are old" else printfn "You are young"

let message = if age > 42 then "old" else "young"
printfn "You are %s" message

fantom

if (age > 42)
echo("You are old")
else
echo("You are young")

echo((age > 42) ? "You are old" : "You are young")

groovy

if (age > 42)
println "You are old"
else
println "You are young"

println "You are " + (age > 42 ? "old" : "young")

haskell

putStrLn ("You are " ++ if age > 42 then "old" else "young")

Perform different actions depending on several boolean conditions (IF .. THEN .. ELSIF .. ELSE)

python

if age > 84:
print 'You are really ancient'
elif age > 30:
print 'You are middle-aged'
else:
print 'You are young'

fsharp

if age > 84 then printfn "You are really ancient"
elif age > 30 then printfn "You are middle-aged"
else printfn "You are young"

let message = match age with
| _ when age > 84 -> "really ancient"
| _ when age > 30 -> "middle-aged"
| _ -> "young"
printfn "You are %s" message

fantom

if (age > 84)
echo("You are really ancient")
else if (age > 30)
echo("You are middle-aged")
else
echo("You are young")

groovy

if (age > 84)
println "You are really ancient"
else if (age > 30)
println "You are middle-aged"
else
println "You are young"

Replacing a conditional with many branches with a switch/case statement

Many languages support more compact forms of branching than just if ... then ... else such as switch or case or match. Use such a form to add an appropriate placing suffix to the numbers 1..40, e.g. 1st, 2nd, 3rd, 4th, ..., 11th, 12th, ... 39th, 40th

python

def affix(num):
num = num == 1 and str(num) + 'st' or num == 2 and str(num) + 'nd' or \
num == 3 and str(num) +'rd' or str(num) + 'th'
return num

print [affix(x) for x in xrange(1,41)]

fsharp

let suffix = function
| n when n > 10 && n < 20 -> "th"
| n when n % 10 = 1 -> "st"
| n when n % 10 = 2 -> "nd"
| n when n % 10 = 3 -> "rd"
| _ -> "th"

seq { 1 .. 40 }
|> Seq.iter (fun n -> printfn "%i%s" n (suffix n))

fantom

suffix := |Int n -> Str|
{
if ((4..20).contains(n % 100))
return "th"

switch((n.toStr)[-1])
{
case '1': return "st"
case '2': return "nd"
case '3': return "rd"
default: return "th"
}
}

(1..40).each { echo("$it${suffix(it)}") }

groovy

def suffix(n) {
switch(n) {
case { n % 100 in 4..20 } : return 'th'
case { n % 10 == 1 } : return 'st'
case { n % 10 == 2 } : return 'nd'
case { n % 10 == 3 } : return 'rd'
default : return 'th'
}
}
(1..40).each { n ->
println "$n${suffix(n)}"
}

haskell

suffixed n = show n ++ suffix
where
suffix
| n `mod` 100 `div` 10 == 1 = "th"
| otherwise = case n `mod` 10 of
1 -> "st"
2 -> "nd"
3 -> "rd"
_ -> "th"

result = map suffixed [1..40]

Loops

Perform an action multiple times based on a boolean condition, checked before the first action (WHILE .. DO)

Starting with a variable x=1, Print the sequence "1,2,4,8,16,32,64,128," by doubling x and checking that x is less than 150.

python

x = 1
while x < 150:
print '%s, ' % x,
x *= 2

fsharp

let mutable x = 1
while x < 150 do printf "%d, " x ; (x <- x * 2) done

// The problem is clearly geared towards imperative languages ;-)
// No need to mutate any variable, here's how to do it loop-free functional:
let rec powers2 i = seq { if i < 150 then yield i; yield! powers2 (i*2) }
powers2 1 |> Seq.iter (fun i -> printf "%i, " i)

fantom

x := 1
while (x < 150) {
Env.cur.out.print("$x,")
x *= 2
}
echo

groovy

x = 1
while (x < 150) {
print x + ","
x *= 2
}
println()

haskell

main :: IO ()
main = loop 1
where
loop x | x < 150 = do
putStr (show x ++ ",")
loop (x * 2)
loop _ = return ()

main = mapM_ print $ takeWhile (<150) $ iterate (* 2) 1

Perform an action multiple times based on a boolean condition, checked after the first action (DO .. WHILE)

Simulate rolling a die until you get a six. Produce random numbers, printing them until a six is rolled. An example output might be "4,2,1,2,6"

python

import random, itertools

def dice():
while True:
yield random.randint(1,6)

print ", ".join(str(d) for d in itertools.takewhile(lambda x: x < 6, dice()))

fsharp

open System
let rand = Random()

Seq.initInfinite (fun _ -> rand.Next(1, 7))
|> Seq.takeWhile (fun x -> x < 6)
|> fun items -> String.Join(",", items)
|> function s when s = "" -> printfn "6" | s -> printfn "%s,6" s

fantom

rnd := 0
while(rnd != 6) {
rnd = Int.random(1..6)
Env.cur.out.print(rnd)
if (rnd != 6)
Env.cur.out.print(",")
}
echo

groovy

// Groovy has no do..while; use a normal while
int dice = 0
while (dice != 6) {
dice = Math.random() * 6 + 1
print dice
if (dice != 6) print ','
}

haskell

import System.Random

diceRolls = do
gen <- newStdGen
print $ takeWhile (/=(6::Int)) (randomRs (1,6) gen)

Perform an action a fixed number of times (FOR)

Display the string "Hello" five times like "HelloHelloHelloHelloHello"

python

print "Hello" * 5

for i in range(5):
print "Hello"

fsharp

for i = 1 to 5 do printf "Hello" done

dotimes 5 (fun () -> printf "Hello")

// Repetition via ranging over a List type(index ignored)
for _ in list do printf "Hello" done

// Repetition via ranging over a Sequence type(index ignored)
for _ in sequence do printf "Hello" done

// Repetition via ranging over an Array type(index ignored)
for _ in array do printf "Hello" done

fantom

5.times { Env.cur.out.print("Hello") }

for (i := 0; i < 5; i++)
Env.cur.out.print("Hello")

(1..5).each { Env.cur.out.print("Hello") }

groovy

println "Hello" * 5

5.times { print "Hello" }; println()

haskell

import Control.Monad

hi5 = replicateM_ 5 $ putStr "Hello"

Perform an action a fixed number of times with a counter

Display the string "10 .. 9 .. 8 .. 7 .. 6 .. 5 .. 4 .. 3 .. 2 .. 1 .. Liftoff!"

python

print " .. ".join(str(i) for i in range(10, 0, -1)), ".. liftoff!"

fsharp

for i = 10 downto 1 do printf "%d .. " i done
printfn "Liftoff!"

// Repetition via ranging over a Sequence type
for i in {10 .. -1 .. 1} do printf "%d .. " i done ; printfn "Liftoff!"

fantom

(10..1).each { Env.cur.out.print("$it .. ") }
Env.cur.out.print("Liftoff!")

for (i := 10; i >= 1; i--)
Env.cur.out.print("$i .. ")
Env.cur.out.print("Liftoff!")

groovy

10.downto(1) { print it + " .. " }
println "Liftoff!"

haskell

countDown = mapM_ printN [10,9..1] >> putStr "Liftoff!"
where printN n = putStr $ show n ++ " .. "

Files

Reading

Read the contents of a file into a string

python

contents = open('myFile.txt', 'rt').read()

fsharp

let file = new FileStream("test.txt", FileMode.Open)
let buffer = new String((new BinaryReader(file)).ReadChars(Convert.ToInt32(file.Length)))

let stream = new StreamReader("test.txt")
let buffer = stream.ReadToEnd()

let buffer = File.ReadAllText("test.txt")

fantom

contents := File(`file.text`).readAllStr

groovy

contents = file.text

haskell

readFile "c:/tmp/myFile.txt"

Process a file one line at a time

Open the source file to your solution and print each line in the file, prefixed by the line number, like:
1> First line of file
2> Second line of file
3> Third line of file

python

for no, line in enumerate(open(__file__)):
print "{0}> {1}".format(no+1, line.rstrip())

fsharp

let stream = new StreamReader("test.txt")
let mutable i = 1
let mutable line = stream.ReadLine()
while (line <> null) do printfn "%d> %s" i line ; line <- stream.ReadLine() ; i <- i + 1 done
stream.Close()

let proc_a_line (filename : string) proc =
let stream = new StreamReader(filename)
let rec proc_a_line' count line =
match line with
| null -> stream.Close()
| _ -> proc count line ; proc_a_line' (count + 1) (stream.ReadLine())
proc_a_line' 1 (stream.ReadLine())

// ------

let _ = proc_a_line "test.txt" (fun i line -> printfn "%d> %s" i line)

let reader(filename : string) = seq {
use sr = new StreamReader(filename)
while not sr.EndOfStream do
let line = sr.ReadLine()
yield line
done
}

// ------

reader("test.txt") |> Seq.iteri (fun i line -> printfn "%d> %s" (i + 1) line)

File.ReadAllLines("test.txt") |> Array.iteri (fun i line -> printfn "%d> %s" (i + 1) line)

// Unlike ReadAllLines, ReadLines (new in .NET 4) only reads the file
// one line at a time, rather than reading the entire file into an array first.

open System.IO
File.ReadLines("test.txt") |> Seq.iteri (fun i line -> printfn "%d> %s" (i + 1) line)

fantom

File(`input.text`).readAllLines.each |Str s, Int i| { echo("${i+1}> $s") }

groovy

int count = 0
file.eachLine { line ->
println "${++count} > $line"
}

file.eachLine { line, count ->
println "${++count} > $line"
}

haskell

import Data.List

prefixWithNumber str n = show n ++ "> " ++ str

numberStrings (x:xs) n = prefixWithNumber x n : (numberStrings xs (n+1))
numberStrings [] n = []

main = do
str <- readFile "prefix.hs"
putStrLn (intercalate "\n" (numberStrings (lines str) 1))

prefix n str = show n ++ "> " ++ str

main = readFile "prefix.hs" >>=
putStr . unlines . zipWith prefix [1..] . lines

Writing

Write a string to a file

python

open('test.txt', 'wt').write('Hello World!')

fsharp

let stream = new StreamWriter("test.txt", false)
stream.WriteLine("This line overwrites file contents!")

fantom

File(`out.txt`).out.writeChars("some text").flush

groovy

file.delete()
file << 'some text'

file.text = 'some text'

haskell

writeFile "filename" "stringe"

Append to a file

python

open('test.txt', 'at').write('Hello World!\n')

fsharp

let stream = new StreamWriter("test.txt", true)
stream.WriteLine("This line appended to file!")

fantom

File(`out.txt`).out(true).writeChars("some text").flush

groovy

file << 'some text'

haskell

appendfile "filename" "string"

Directories

Process each file in a directory

python

import os
results = (process(f) for f in os.listdir(".") if os.path.isfile(f))

fsharp

let dirname = "c:\\"

let processFile filename = printfn "%s" filename
for filename in Directory.GetFiles(dirname) do processFile filename done

let dirname = "c:\\"

Directory.GetFiles(dirname) |> Array.iter (fun filename -> printfn "%s" filename)

fantom

File(`./`).list.each { process(it) }

groovy

dir.eachFile{ f -> process(f) }

haskell

import System.Directory
import Control.Monad

process filename = putStrLn filename

main = getDirectoryContents "." >>=
filterM doesFileExist >>=
mapM_ process

Process each file in a directory recursively

python

import os
results = (process(os.path.join(p, n)) for p,d,l in os.walk(".") for n in l)

fsharp

let processDirectory dirname proc =
let rec processDirectory' dirname' =
Directory.GetFiles(dirname') |> Array.iter proc
Directory.GetDirectories(dirname') |> Array.iter processDirectory'
processDirectory' dirname

// ------

let dirname = "c:\\"

processDirectory dirname (fun filename -> printfn "%s" filename)

fantom

File(`./`).walk { process(it) }

groovy

dir.eachFileRecurse{ f -> process(f) }

haskell

import System.Directory (doesFileExist, getDirectoryContents)
import System.FilePath ((</>))

process :: FilePath -> IO ()
process filename = putStrLn filename

mapDir :: (FilePath -> IO ()) -> FilePath -> IO ()
mapDir proc fp = do
isFile <- doesFileExist fp -- is a file of fp
if isFile then proc fp -- process the file
else getDirectoryContents fp >>=
mapM_ (mapDir proc . (fp </>)) . filter (`notElem` [".", ".."])

main = mapDir process "."

Dates

Parsing

Parse a date and time from a string

Given the string "2008-05-06 13:29", parse it as a date representing 6th March, 2008 1:29:00pm in the local time zone.

python

import time
time.strptime("2008-05-06 13:29", "%Y-%m-%d %H:%M")

fsharp

let dateTime = DateTimeOffset.Parse("2008-05-06 13:29")

// Use format specifiers to appropriately format string
// 1. Default culture
printfn "%s" (dateTime.ToString("d MMMM, yyyy h:mm:sstt"))

// 2. Nominated culture
Console.WriteLine("{0}", dateTime.ToString("d MMMM, yyyy h:mm:sstt"), Globalization.CultureInfo.CreateSpecificCulture("en-us"))

let dateTime = DateTimeOffset.Parse("2008-05-06 13:29")

// Customize date/time string
let dsb = ((new StringBuilder(40)).Append(dateTime.ToString("%d")).Append("th ").Append(dateTime.ToString("MMMM, yyyy h:mm:ss")).Append(dateTime.ToString("tt").ToLower()))

printfn "%s" (dsb.ToString())

fantom

dt := DateTime.fromLocale("2008-05-06 13:29", "YYYY-MM-DD hh:mm")

groovy

def date = new SimpleDateFormat("yyy-MM-dd HH:mm").parse("2008-05-06 13:29")

def date = Date.parse("yyy-MM-dd HH:mm", "2008-05-06 13:29")

Printing

Display information about a date

Display the day of month, day of year, month name and day name of the day 8 days from now.

python

from datetime import datetime, timedelta

eightDaysFromNow = datetime.now() + timedelta(days=8)

print eightDaysFromNow.strftime('%d') # day of month
print eightDaysFromNow.strftime('%j') # day of year
print eightDaysFromNow.strftime('%B') # month name FULL
print eightDaysFromNow.strftime('%A') # day of week name FULL

fsharp

Using F# interactive

> let Then = DateTime.Now.AddDays(8.0)
- let dayNumber = Then.DayOfYear.ToString()
- let solution = Then.ToString("dd " + dayNumber + " MMMM dddd");;

val Then : DateTime = 08/08/2010 08:58:05
val dayNumber : string = "220"
val solution : string = "08 220 August Sunday"

>

fantom

date := Date.today + 8day
echo(date.day)
echo(date.dayOfYear)
echo(date.month.localeFull)
echo(date.weekday.localeFull)

groovy

use (TimeCategory) {
eight_days_time = 1.week.from.now + 1.day
}
println eight_days_time[DAY_OF_MONTH]
println eight_days_time.format('d') // alternative to above
println eight_days_time[DAY_OF_YEAR]
println eight_days_time.format('MMMM')
println eight_days_time.format('EEEE')

Display a date in different locales

Display a language/locale friendly version of New Year's Day for 2009 for several languages/locales. E.g. for languages English, French, German, Italian, Dutch the output might be something like:

Thursday, January 1, 2009
jeudi 1 janvier 2009
giovedì 1 gennaio 2009
Donnerstag, 1. Januar 2009
donderdag 1 januari 2009

(Indicate in comments where possible if any language specific or operating system configuration needs to be in place.)

python

from datetime import datetime
from locale import setlocale, LC_TIME

now = datetime(2009, 1, 1)

locales = ('en_us', 'fr_fr', 'it_it', 'de_de', 'nl_nl')
for locale in locales:
setlocale(LC_TIME, locale)
print now.strftime('%A, %B %d %Y')

fsharp

open System
open System.Globalization

let jan1 = DateTime(2009, 1, 1)

[ "en-US"; "fr-FR"; "de-DE"; "it-IT"; "nl-NL" ]
|> List.map CultureInfo.CreateSpecificCulture
|> List.map (fun c -> jan1.ToString("D", c))
|> List.iter (printfn "%s")

fantom

// May require modification of Fantom distribution t
// for undefined locales - basically just create a '<locale-name>.props' plain text file with values like this:
// sunAbbr=Sun
// ..
// sunFull=Sunday
["en", "fr", "ru"].map { Locale(it) }.each |Locale l| {
l.use { echo(Date(2009, Month.jan, 1).toLocale("WWWW, MMMM D, YYYY")) }
}

groovy

cal = Calendar.instance
cal.set(2009, JANUARY, 1)
[ENGLISH, FRENCH, ITALIAN, GERMAN, new Locale('nl')].each { lang ->
println getDateInstance(FULL, lang).format(cal.time)
}

// relies on Java I18N capabilities which supports many locales, see:
// http://java.sun.com/javase/technologies/core/basic/intl/
// available Locales may depend on your version of Java and/or
// operating system and/or installed fonts

Creation

Display the current date and time

Create a Date object representing the current date and time. Print it out.
If you can also do this without creating a Date object you can show that too.

python

from datetime import datetime
print datetime.utcnow()

fsharp

printfn "%A" System.DateTime.Now

fantom

echo(DateTime.now)

groovy

println new Date()

haskell

import System.Time

main = do ct <- getClockTime
print ct

import Data.Time

main = do zt <- getZonedTime
print zt

OOP

Basics

Define a class

Declare a class named Greeter that takes a string on creation and greets using this string if you call the "greet" method.

python

class Greeter(object):
""" Greet someone.
"""
def __init__(self, whom):
self._whom = whom
def greet(self):
print "Hello, %s!" % self._whom

Greeter("world").greet()

fsharp

type Greeter(whom' : string) =
member this.greet() = printfn "Hello, %s!" whom'

(new Greeter("world")).greet()

type Greeter(whom' : string) =
let whom : string = whom'
member this.greet() = printfn "Hello, %s!" whom

(new Greeter("world")).greet()

type Greeter =
class
val whom : string
new(whom') = { whom = whom' }
member this.greet() = printfn "Hello, %s!" this.whom
end

(new Greeter("world")).greet()

fantom

class Greeter
{
private Str whom
new make(Str whom) { this.whom = whom }
Void greet() { echo("Hello, $whom") }
}

Greeter("world").greet

groovy

// version using named parameters
class Greeter {
def whom
def greet() { println "Hello, $whom" }
}
new Greeter(whom:'world').greet()

// version using traditional constructor
class Greeter {
private whom
Greeter(whom) { this.whom = whom }
def greet() { println "Hello, $whom" }
}
new Greeter('world').greet()

haskell

data Greeter = Greeter String

class Greets a where
greet :: a -> IO ()

instance Greets Greeter where
greet (Greeter s) = print s

main = greet (Greeter "Hello")

Instantiate object with mutable state

Reimplement the Greeter class so that the 'whom' property or data member remains private but is mutable, and is provided with getter and setter methods. Invoke the setter to change the greetee, invoke 'greet', then use the getter in displaying the line, "I have just greeted {whom}.".

For example, if the greetee is changed to 'Tommy' using the setter, the 'greet' method would display:

Hello, Tommy!

The getter would then be used to display the line:

I have just greeted Tommy.

python

class Greeter(object):
_whom = None

def __init__(self, whom):
self._whom = whom

@property
def whom(self):
return self._whom

@propset(whom)
def whom(self, value=None):
self._whom = value

def greet(self):
print 'Helo, %s!' % self._whom

greeter = Greeter('Winston')
greeter.greet()
greeter.whom = 'Tommy'
greeter.greet()

# required for Python 2.5 or less
def propset(prop):
assert isinstance(prop, property)
def helper(func):
return property(prop.fget, func, prop.fdel, prop.__doc__)
return helper

class Greeter(object):
_whom = None

def __init__(self, whom):
self._whom = whom

@property
def whom(self):
return self._whom

@propset(whom)
def whom(self, value=None):
self._whom = value

def greet(self):
print 'Helo, %s!' % self._whom

greeter = Greeter('Winston')
greeter.greet()
greeter.whom = 'Tommy'
greeter.greet()

fsharp

type Greeter(name:string) =
let mutable whom = name

member this.Whom
with get () = whom
and set v = whom <- v

member this.Greet() =
printfn "Hello, %s!" whom

let greeter = Greeter("World")
greeter.Greet()
greeter.Whom <- "Tommy"
greeter.Greet()
printfn "I have just greeted %s." greeter.Whom

fantom

class Greeter
{
new make(Str whom) { this.whom = whom }
Void greet() { echo("Hello, $whom!") }
Str whom
}

greeter := Greeter("world")
greeter.greet
greeter.whom = "Tommy"
echo("I have just greeted ${greeter.whom}.")

groovy

class Greeter {
def whom
def greet() { println "Hello, $whom!" }
}

greeter = new Greeter(whom:"world"); greeter.greet()

greeter.whom = 'Tommy'; greeter.greet()
println "I have just greeted $greeter.whom"

haskell

data Greeter = G { greeting :: String, greetee :: String }

class Greets a where
greet :: a -> IO ()

instance Greets Greeter where
greet g = print (greeting g)

main = do
let g = G { greeting = "Hello", greetee = "{whom}" }
greet g
print $ "I have just greeted " ++ greetee g { greetee = "Tommy" }

Inheritance

Implement Inheritance Heirarchy

Implement a Shape abstract class which will form the base of an inheritance hierarchy that models 2D geometric shapes. It will have:

* A non-mutable 'name' property or data member set by derived or descendant classes at construction time
* A 'area' method intended to be overridden by derived or descendant classes ( double precision floating point return value)
* A 'print' method (also for overriding) will display the shape

's name, area, and all shape-specific values



Two derived or descendant classes will be created:

* Circle    -> Constructor requires a '

radius' argument, and a 'circumference

' method to be implemented  

* Rectangle -> Constructor requires '

length' and 'breadth' arguments, and a 'perimeter

' method to be implemented 



Instantiate an object of each class, and invoke each objects '

print' method to show relevant details.

python

#Start with the import statements.
import math # necessary to get the value of pi

class Shape(object):
"""Shape Class"""
def __init__(self):
"""Constructor method"""
pass #Do nothing here
def area(self):
"""The area method"""
pass #Do nothing here
def print_(self):
"""
The print method. Note the trailing underscore - this is because
there is a reserved statement called 'print' in python 2.x. The
trailing underscore is the accepted method of re-using names without
rebinding them
"""
print 'The name is: %s' % self.name #Print the only property we currently have

def _getName(self):
"""The getter method for the 'name' property.
Note that getter methods are generally discouraged in python"""
return self._name

_name = None # The leading underscore gives a weak non-public value
# to a variable. Two leading underscores will mangle its
# name at runtime, to make it more difficult to access.
# Note there is no real 'private' variable type in python.
name = property(_getName, doc='The name of this object')
# property statements work like: property(fget=None, fset=None, fdel=None, doc=None)

class Circle(Shape):
"""Circle Class - a sub class of shape"""
def __init__(self, radius, name='Circle'):
"""Constructor method again"""
Shape.__init__(self) # init the super class
self.radius = radius # Store the radius
self._setCircumference()# Function call
self._name = name

def _setCircumference(self):
self.circumference = 2*math.pi*self.radius

def area(self):
'''Return the area of this circle'''
tmpAera = math.pi * self.radius**2
return tmpAera
def print_(self):
'''The print method'''
super(Circle, self).print_() # This calls the print_ method in
# the super classes of Circle, in
# this case Shape
print 'The radius is: %f' % self.radius
print 'The circumference is %f' % self.circumference
print 'The area is: %f' % self.area()

class Rectangle(Shape):
"""The Rectangle Class"""
def __init__(self, length, breadth, name='Rectangle'):
Shape.__init__(self)
self._name = name
self.length = length
self.breadth = breadth
self.perimeter()
def area(self):
return self.breadth*self.length
def perimeter(self):
self._perimeter = self.breadth*2+self.length*2
return self._perimeter # You have a method return a value and still
# safely call it without handling the return
# value. This would be collected by garbage
# collection.
def print_(self):
super(Rectangle, self).print_()
print 'The length is %f and the breadth is %f' %(self.length, self.breadth)
print 'The perimeter is: %f' %self._perimeter
print 'The area is: %f' % self.area()

if __name__ == '__main__':
rectangle = Rectangle(5,3)
circle = Circle(5, name='Round and Round')
rectangle.print_()
circle.print_()

fsharp

[<AbstractClass>]
type Shape(name:string) =
member this.Name = name
abstract Area : float
abstract Print : unit -> unit

type Circle(name, radius:float) =
inherit Shape(name)
member this.Radius = radius
member this.Circumference =
System.Math.PI * radius * 2.
override this.Area =
System.Math.PI * radius * radius
override this.Print() =
printfn "Circle: %s" this.Name
printfn "Area: %f" this.Area
printfn "Circumference: %f" this.Circumference
printfn "Radius: %f" this.Radius

type Rectangle(name, length:float, breadth:float) =
inherit Shape(name)
member this.Length = length
member this.Breadth = breadth
member this.Perimiter =
(length * 2.) + (breadth * 2.)
override this.Area =
length * breadth
override this.Print() =
printfn "Rectangle: %s" this.Name
printfn "Area: %f" this.Area
printfn "Perimiter: %f" this.Perimiter
printfn "Length: %f" this.Length
printfn "Breadth: %f" this.Breadth

let c = Circle("Foo", 2.1)
let r = Rectangle("Bar", 2.2, 3.3)

c.Print()
printfn ""
r.Print()

fantom

abstract class Shape
{
const Str name
new make(Str name) { this.name = name }
abstract Float area()
abstract Void print()
}

class Circle : Shape
{
private Float radius

new make(Float radius) : super("circle") { this.radius = radius }
Float circumference() { return 2 * Float.pi * radius }
override Float area() { return Float.pi * radius.pow(2.0f) }
override Void print()
{
echo("I am a $name with radius $radius, area $area
and circumference $circumference")
}
}

class Rectangle : Shape
{
private Float length
private Float breadth

new make(Float length, Float breadth) : super("rectangle")
{
this.length = length
this.breadth = breadth
}
Float perimeter() { return 2 * (length + breadth) }
override Float area() { return length * breadth }
override Void print()
{
echo("I am a $name with length $length, breadth $breadth,
area $area and perimeter $perimeter")
}
}

circle := Circle(4.0f)
circle.print
rectangle := Rectangle(2.0f, 5.5f)
rectangle.print

groovy

abstract class Shape {
final name
Shape(name) { this.name = name }
abstract area()
abstract print()
}

class Circle extends Shape {
final radius
Circle(radius) {
super('circle')
this.radius = radius
}
def area() { Math.PI * radius * radius }
def circumference() { 2 * Math.PI * radius }
def print() {
println "I am a $name with ->"
printf 'Radius: %.2f\n', radius
printf 'Area: %.2f\n', area()
printf 'Circumference: %.2f\n', circumference()
}
}

class Rectangle extends Shape {
final length, breadth
def Rectangle(length, breadth) {
super("rectangle")
this.length = length
this.breadth = breadth
}
def area() { length * breadth }
def perimeter() { 2 * length + 2 * breadth }
def print() {
println "I am a $name with ->"
printf 'Length, Width: %.2f, %.2f\n', length, breadth
printf 'Area: %.2f\n', area()
printf 'Perimeter: %.2f\n', perimeter()
}
}

shapes = [new Circle(4.2), new Rectangle(2.7, 3.1), new Rectangle(6.2, 2.6), new Circle(17.3)]
shapes.each { shape -> shape.print() }

haskell

data Circle = C { namec :: String, radius :: Float }
data Rectangle = R { namer :: String, len :: Float, breadth :: Float }

circumference (C _ r) = 2 * pi * r
perimeter (R _ l b) = 2 * (l + b)

class Shape a where
area :: a -> Float
name :: a -> String
println :: a -> IO ()

instance Shape Circle where
area (C _ r) = pi * r * r
println c = print $ namec c ++ " : area = " ++
show (area c) ++ ", radius = " ++
show (radius c)
name (C n _) = n

instance Shape Rectangle where
area (R _ l b) = l * b
println r = print $ namer r ++ " : area = " ++
show (area r) ++ ", length = " ++
show (len r) ++ ", breadth = " ++
show (breadth r)
name (R n _ _) = n

main = do
let c = C { namec = "Circle", radius = 2.34 }
r = R { namer = "Rectangle", len = 3.4, breadth = 2.456 }
println c
println r

Implement and use an Interface

Create a Serializable interface consisting of 'save' and 'restore' methods, each of which:

* Accept a stream or handle or descriptor argument for the source or destination
* Save to destination or restore from source the properties or data members of the implementing class (restrict yourself to the primitive types 'int' and 'string')

Next, create a Person class which has 'name' and 'age' properties or data members and implements this interface. Instantiate a Person object, save it to a serial stream, and instantiate a new Person object by restoring it from the serial stream.

python

import pickle

class Person:
def __init__(self, name, age):
self.name = name
self.age = age
def __str__(self):
return "Name: {name}, age: {age}".format(name=self.name, age=self.age)

person = Person("Gaylord Focker", 21)
with open("person.pickle", "wb") as outstream:
pickle.dump(person, outstream)
with open("person.pickle", "rb") as instream:
deserialized_person = pickle.load(instream)
print(deserialized_person)

fsharp

// Since everyone else is using built-in functionality instead of
// defining an interface as required, I won't buck the trend.
// Maybe this problem should be named "Use serialization features" instead
// of "Implement and use an Interface"

open System
open System.IO
open System.Runtime.Serialization.Formatters.Binary

[<Serializable>]
type Person(name:string, age:int) =
member this.Name = name
member this.Age = age

let serialize x =
use ms = new MemoryStream()
let bf = new BinaryFormatter()
bf.Serialize(ms, x)
ms.ToArray()

let deserialize<'a> bytes =
use ms = new MemoryStream(bytes:byte[])
let bf = new BinaryFormatter()
bf.Deserialize(ms) :?> 'a

let before = Person("Joel", 35)
let bytes = serialize before
let after = deserialize<Person> bytes

printfn "Before: %s, %i" before.Name before.Age
printfn "After: %s, %i" after.Name after.Age

fantom

@Serializable
class Person
{
Str name
Int age
new make(|This| f) { f(this) }
}

person := Person() { name="Tom Bones"; age=23 }
File(`tommy.dump`).out.writeObj(person).close
Person tom := File(`tommy.dump`).in.readObj

groovy

// Built-in functionality but with slightly different names. Showing usage:
class Person implements Serializable { String name; int age }
p1 = new Person(name:'John', age:21)
p2 = null
output = new ByteArrayOutputStream() // or FileOutputStream, etc.
output.withObjectOutputStream { oos -> oos << p1 }
input = new ByteArrayInputStream(output.toByteArray())
input.withObjectInputStream(getClass().classLoader){ ois -> p2 = ois.readObject() }
assert p2.name == 'John'
assert p2.age == 21

haskell

import Data.Binary
import Control.Monad (liftM2)

data People = People { name :: String, age :: Integer }
deriving (Eq, Show)

class Serializable a where
save :: FilePath -> a -> IO ()
restore :: FilePath -> IO a

instance Serializable People where
save = encodeFile
restore = decodeFile

instance Binary People where
put (People n a) = put n >> put a
get = liftM2 People get get

main = do let fp = "people.dat"
p = People { name = "Joe", age = 24 }
save fp p
p' <- restore fp
print (p' :: People)

Networking

HTTP

Check your language appears on the langref.org site

Your language name should appear within the HTML found at the http://langreg.org main page.

python

from urllib import urlopen
print urlopen('http://langref.org').read().find('python') >= 0 and 'found' or 'not found'

fsharp

let httpReq = (WebRequest.Create(url) :?> HttpWebRequest)
httpReq.KeepAlive <- false
let httpStream = new StreamReader(httpReq.GetResponse().GetResponseStream())
let htmlPage = httpStream.ReadToEnd()
httpStream.Close()

let offerStatus = (if (htmlPage.IndexOf(url ^ language) > 0) then "offers" ; else "does not offer")
Console.WriteLine("{0} {1} {2}", url, offerStatus, language)

fantom

language := "Fantom"
url := `http://langref.org/`

response := WebClient(url).getStr
if (Regex.fromStr("\\b$language.lower\\b").matcher(response).find)
echo("Language $language appears at ${url}.")

groovy

assert new URL('http://langref.org').text.contains('groovy')

SMTP

Send an email

Use library functions, classes or objects to create a short email addressed to your own email address. The subject should be, "Greetings from langref.org", and the user should be prompted for the message body, and whether to cancel or proceed with sending the email.

python

import smtplib
import locale

from email.mime.text import MIMEText

encoding = locale.getpreferredencoding()

def main():
smtp_servername = "smtp.example.com"

from_addr = "ernie@example.com"
to_addr = "cookie.monster@mailinator.com"

body = raw_input("Enter the email message ")
if not raw_input("Send email? y/N ") in ["y", "Y"]:
print "aborting"
return

message = MIMEText(body, _charset=encoding)

message["From"] = from_addr
message["To"] = to_addr
message["Subject"] = "Greetings from langref.org"

server = smtplib.SMTP(smtp_servername)
server.sendmail(from_addr, to_addr, message.as_string())

if __name__ == "__main__":
main()

fsharp

open System
open System.Net
open System.Net.Mail
open System.Net.Mime

let subject = "Greetings from langref.org"
let from = "username@gmail.com"
let destination = "username@gmail.com"

printfn "Write mail body (press 'Enter' when finished):"
let mutable body = Console.ReadLine()
if body = null || body.Length = 0 then
body <- "Hello World"

let mail = new MailMessage(from, destination, subject, body)

let smtpHost = "smtp.gmail.com"
let clientCredentials = new NetworkCredential("username@gmail.com", "password")
let smtpClient = new SmtpClient(smtpHost,587)
smtpClient.EnableSsl <- true
smtpClient.UseDefaultCredentials <- false
smtpClient.Credentials <- clientCredentials

printfn "Send email? y/n"
match Console.ReadLine() with
| "y" -> smtpClient.Send(mail);mail.Dispose();printfn "email delivered"
| "n" -> smtpClient.Dispose()
| _ -> smtpClient.Dispose()

fantom

// read message body
echo("Enter message body. End the message with '.' character on a separate line:")
in := Env.cur.in
buf := StrBuf()
line := in.readLine;
while (line != null)
{
if (line.trim == ".")
break;
buf.add(line)
line = in.readLine
}

// construct email
email := Email
{
to = [ "someone@somewhere" ]
from = "me@mydomain"
subject = "Greetings from langref.org"
body = TextPart { text = buf.toStr }
}
mailClient := SmtpClient
{
host = "smtp.somewhere.net"
username = "me"
password = "my password"
log.level = LogLevel.debug
}

// send or abort
echo("Send email '$email.subject' to $email.to?: ");
line = in.readLine
echo("response=$line")
if (line?.trim.compareIgnoreCase("y") == 0)
mailClient.send(email)
else
echo("Aborted!")

groovy

// numerous libraries exist, this uses ant
// needs these jars: mailapi.jar, smtp.jar, ant-javamail.jar, ant-nodeps.jar
new AntBuilder().with {
input(message:'Message to send:', addproperty:'body')
input(message:'Send email?', validargs:'y,n,Y,N', addproperty:'confirm')
condition(property:'abort') { matches(string:'${confirm}', pattern:'n|N') }
fail(if:'abort', 'Email send aborted by user')
mail(mailhost:'smtp.gmail.com', mailport:'465', ssl:'on', user:'you@gmail.com',
subject:'Greetings from langref.org', password:'your_password'){
from(address:'you@gmail.com')
to(address:'rob@langref.org')
message('${body}')
}
}

XML

Parsing

Process an XML document

Given the XML Document:

<shopping>
<item name="bread" quantity="3" price="2.50"/>
<item name="milk" quantity="2" price="3.50"/>
</shopping>

Print out the total cost of the items, e.g. $14.50

python

from xml.dom.minidom import parseString
document = parseString(
"""<shopping>
<item name="bread" quantity="3" price="2.50"/>
<item name="milk" quantity="2" price="3.50"/>
</shopping>""").documentElement
total = sum([float(item.getAttribute('price')) *
int(item.getAttribute('quantity'))
for item in document.getElementsByTagName('item')])
print '$%.2f' % total

fsharp

#r @"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.5\System.Xml.Linq.dll"

open System
open System.Xml.Linq
//XElement Helper
let xname sname = XName.Get sname

let xmlsnippet =
let snippet = new XElement(xname "shopping")
//create bread
let bread = new XElement(xname "item")
bread.SetAttributeValue(xname "name","bread")
bread.SetAttributeValue(xname "quantity",3)
bread.SetAttributeValue(xname "price",2.50)
//add bread to snippet
snippet.Add(bread)
//create milk
let milk = new XElement(xname "item")
milk.SetAttributeValue(xname "name","milk")
milk.SetAttributeValue(xname "quantity",2)
milk.SetAttributeValue(xname "price",3.50)
//add milk to snippet
snippet.Add(milk)
snippet

let totalprice (xe: XElement) =
xe.Descendants(xname "item")
|> Seq.map(fun i -> Double.Parse(i.Attribute(xname "price").Value))
|> Seq.fold(fun acc x -> acc + x) 0.0

let xname sname = XName.Get sname
let xattr (elem: XElement) sname = elem.Attribute(xname sname).Value
let xml = XDocument.Load("xml.txt")

let shoppingCost =
xml.Descendants(xname "item")
|> Seq.map (fun i -> Double.Parse(xattr i "quantity"), Double.Parse(xattr i "price"))
|> Seq.sumBy (fun (quantity, price) -> quantity * price)

// Alternative solution that uses XML Navigation, and XPath expressions to ensure that
// the items have the required attributes
let xname sname = XName.Get sname
let xattr (elem: XElement) sname = elem.Attribute(xname sname).Value

let navigator = XPathDocument("xml.txt").CreateNavigator()
let path = XPathExpression.Compile("/shopping/item[@price][@quantity]")
let names = XmlNamespaceManager(navigator.NameTable)
path.SetContext(names)
let shoppingCost =
match path.ReturnType with
| XPathResultType.NodeSet ->
navigator.Select(path)
|> Seq.cast
|> Seq.map (fun (i: XPathNavigator) ->
if i.IsNode then
let elem = XElement.Parse(i.OuterXml)
Double.Parse(xattr elem "quantity"), Double.Parse(xattr elem "price")
else
failwith "Error in expression, expecting to see a node"
)
|> Seq.sumBy (fun (quantity, price) -> quantity * price)
| _ -> failwith "Error in expression, expecting to see a node set"

fantom

sum := 0.0
root := XParser(File(`shop.xml`).in).parseDoc.root
if (root.name == "shopping")
{
root.elems.each
{
if (it.name == "item")
{
quantity := Int.fromStr(it.get("quantity"))
price := Decimal.fromStr(it.get("price"))
sum += quantity * price;
}
}
}
echo("\$$sum")

groovy

printf '$%.2f\n', new XmlSlurper().parseText(xml).item.collect{
it.@quantity.toInteger() * it.@price.toFloat()
}.sum()

haskell

File Edit Options Buffers Tools Haskell Help
import Text.ParserCombinators.Parsec
import Control.Monad
import System ( getArgs )

data Item = Item { name :: String,
quantity :: Int,
price :: Int }
deriving Show

type Basket = [Item]

item :: Parser Item
item = do string "<item name=\""
name <- manyTill letter (char '\"')
string " quantity=\""
quantity <- liftM read $ many digit
string "\" price=\""
dollars <- liftM read $ many digit
cents <- option 0 (char '.' >> (liftM read $ many digit))
string "\"/>"
return $ Item name quantity (100 * dollars + cents)

basket :: Parser Basket
basket = do string "<shopping>"
items <- manyTill item (try $ string "</shopping>")
return items

parseBasket :: String -> Basket
parseBasket input = case parse basket "Shopping Basket" input of
Left _ -> []
Right val -> val

main = do args <- getArgs
putStrLn $ show . (/100) . fromIntegral . sum . map (\(Item _ q p) -> q * p) . parseBasket $ head args

import Text.XML.HXT.Core
import Text.Printf

main :: IO ()
main = do
prices <- runX (process "basket.xml")
printf "$%.2f\n" $ sum prices

process :: FilePath -> IOSArrow XmlTree Double
process filename =
readDocument [withValidate no] filename >>>
getChildren >>>
isElem >>> hasName "shopping" >>>
getChildren >>>
isElem >>> hasName "item" >>>
getQuantity &&& getPrice >>>
arr (uncurry (*))

getQuantity :: IOSArrow XmlTree Double
getQuantity =
getAttrl >>> hasName "quantity" >>> getChildren >>>
getText >>> arr read

getPrice :: IOSArrow XmlTree Double
getPrice =
getAttrl >>> hasName "price" >>> getChildren >>>
getText >>> arr read

Creation

create some XML programmatically

Given the following CSV:

bread,3,2.50
milk,2,3.50

Produce the equivalent information in XML, e.g.:

<shopping>
<item name="bread" quantity="3" price="2.50" />
<item name="milk" quantity="2" price="3.50" />
</shopping>

python

from xml.dom import minidom

csv = """bread,3,2.50
milk,2,3.50"""

doc = minidom.Document()
shopping = doc.createElement("shopping")

for line in csv.split("\n"):
name, quantity, price = line.split(",")
el = doc.createElement("item")
el.setAttribute("name", name)
el.setAttribute("quantity", quantity)
el.setAttribute("price", price)
shopping.appendChild(el)

print shopping.toprettyxml()

from xml.etree.ElementTree import Element, SubElement, tostring

csv = """bread,3,2.50
milk,2,3.50"""

root = Element('shopping')

for line in csv.split("\n"):
name, quantity, price = line.split(",")
SubElement(root,'item', {'name' : name,
'quantity' : quantity,
'price' : price })

print tostring(root)

fsharp

#r "System.Xml.dll"
#r "System.Xml.Linq.dll"

open System
open System.Xml
open System.Xml.Linq

let data = "bread,3,2.50
milk,2,3.50"

let X name =
XName.Get(name)

let lines = data.Split( [|"\n" |], StringSplitOptions.RemoveEmptyEntries)

let document = new XDocument()
let element = new XElement(X "shopping")
document.Add(element)

lines
|> Seq.iter (fun line ->
let items = line.Split([|','|])
let item = new XElement(X "item",
new XAttribute(X "name", items.[0]),
new XAttribute(X "quantity", items.[1]),
new XAttribute(X "price", items.[2]))
element.Add(item))

let output = document.ToString();;

fantom

sum := 0.0
rows := CsvInStream(File(`shop.csv`).in).readAllRows

doc := XDoc()
doc.root = XElem("shopping")
{
root := it
rows.each |Str[] row|
{
root.add(XElem("item")
{
XAttr("name", row[0]),
XAttr("quantity", row[1]),
XAttr("price", row[2])
})
}
}

os := File(`shop.xml`).out
doc.write(os)
os.close

groovy

b = new groovy.xml.MarkupBuilder()
b.shopping {
csv.eachLine { line ->
(n, q, p) = line.split(',')
item(name:n, quantity:q, price:p)
}
}

// Groovy equivalent of Java JAXB solution
@XmlAccessorType(NONE)
class Item {
@XmlAttribute String name
@XmlAttribute Integer quantity
@XmlAttribute Double price
}

@XmlAccessorType(NONE)
@XmlRootElement
class Shopping {
@XmlElement Set<Item> items = []
}

Shopping shopping = new Shopping()
csvtext.eachLine{ line ->
(n, q, p) = line.split(',')
shopping.items << new Item(name:n, quantity:q.toInteger(), price:p.toDouble())
}
JAXB.marshal shopping, System.out

Algorithms

Geometry

Find all Pythagorean triangles with length or height less than or equal to 20

Pythagorean triangles are right angle triangles whose sides comply with the following equation:

a * a + b * b = c * c

where c represents the length of the hypotenuse, and a and b represent the lengths of the other two sides. Find all such triangles where a, b and c are non-zero integers with a and b less than or equal to 20. Sort your results by the size of the hypotenuse. The expected answer is:

[3, 4, 5]
[6, 8, 10]
[5, 12, 13]
[9, 12, 15]
[8, 15, 17]
[12, 16, 20]
[15, 20, 25]

python

from math import sqrt

a = 1
ret = []
while a <= 20:
b = 1
while b <= 20:
c = sqrt((a**2)+(b**2))
if int(c) == c and sorted([a,b,int(c)]) not in ret:
ret.append(sorted([a,b,int(c)]))
b +=1
a +=1
print ret

or if you wanna get snarky..

print sorted(set([tuple(sorted((a,b,int(sqrt((a**2)+(b**2)))))) for a in xrange(1,21) for \
b in xrange(1,21) if int(sqrt((a**2)+(b**2))) == sqrt((a**2)+(b**2))]))

fsharp

let getGoodTri (a,b) =
let h = int(System.Math.Sqrt(float(a*a + b*b)))
if a*a + b*b = h*h then Some(a,b,h)
else None

seq{ for i in 1..20 do yield! seq{for j in i..20 do yield i,j} } |> Seq.choose(getGoodTri) |> Seq.sortBy(fun (_,_,c) -> c);;

fantom

triangles := [,]
(1..20).each |Int a|
{
(a..20).each |Int b|
{
c := (a.pow(2) + b.pow(2)).toFloat.sqrt
if (c % c.toInt == 0.0f && !triangles.contains([b,a,c]))
triangles.add([a,b,c.toInt])
}
}
triangles.sort |Int[] x, Int[] y -> Int| { x[2]-y[2] }
echo(triangles)

groovy

Set results = []
for (x in 1..20)
for (y in x..20) {
def z = sqrt(x*x + y*y)
if (z.toInteger() == z) results << [x, y, z.toInteger()]
}
println results.sort{it[2]}.join('\n')

haskell

import Data.List
import Control.Monad

pythTriangles :: [(Int,Int,Int)]
pythTriangles = do
a <- [1..20]
b <- [a+1..20]
c <- [1..2*b]
guard (a*a + b*b == c*c)
return (a,b,c)

cmpThird (_,_,a) (_,_,b)
| a < b = LT
| a == b = EQ
| otherwise = GT

main = mapM_ print (sortBy cmpThird pythTriangles)

import Data.Function
import Data.List

pythTriangles =
[(a,b,c) | a <- [1..20], b <- [a+1..20], c <- [1..2*b], a*a + b*b == c*c]

main = mapM_ print $ sortBy (compare `on` third) pythTriangles where
third (_,_,x) = x

Arithmetic

Greatest Common Divisor

Find the largest positive integer that divides two given numbers without a remainder. For example, the GCD of 8 and 12 is 4.

python

def gcd_recursive(i, j):
if min(i, j) == 0:
return max(i, j)
else:
return gcd_recursive(min(i, j), abs(i - j))

def gcd_iterative(i, j):
while min(i, j) != 0:
i, j = min(i, j), abs(i - j)
return max(i, j)

if __name__ == "__main__":
print gcd_recursive(8, 12)
print gcd_iterative(8, 12)

from fractions import gcd
print gcd(8, 12)

fsharp

let rec gcd x y =
if y = 0 then x
else gcd y (x % y)

fantom

gcd := |Int a, Int b -> Int| {
pair := [a, b].sort
while (pair.first != 0)
pair.set(1, pair.last % pair.first).swap(0, 1)
return pair.last
}
echo(gcd(12, 8)) // a>b, result == 4
echo(gcd(1029, 1071)) // a<b, result == 21

groovy

static def gcd(int i, int j) {
if (Math.min(i,j)==0) return Math.max(i,j)
else return gcd(Math.min(i,j),Math.abs(i-j))
}

haskell

8 `gcd` 12

Misc

Fun

produces a copy of its own source code

In computing, a quine is a computer program which produces a copy of its own source code as its only output.

python

# adapted from a Quine by Sean B. Palmer

print (lambda s='print (lambda s=%r: (s %% s))()': (s % s))()

x='x=%r;print(x%%x)';print(x%x)

fsharp

(fun s -> printf "%s %s" s s) "(fun s -> printf \"%s %s\" s s)"

fantom

class Q
{
static Void main()
{
r := "class Q\n{\n static Void main()\n {\n r := "
s := "\n s := \n echo (r+r.toCode+s[0..9]+s.toCode+s[10..-1])\n }\n}"
echo (r+r.toCode+s[0..9]+s.toCode+s[10..-1])
}
}

class Q{static Void main(){s:="class Q{static Void main(){s:=;c:=34.toChar;echo(s[0..<30]+c+s+c+s[30..-1]);}}";c:=34.toChar;echo(s[0..<30]+c+s+c+s[30..-1]);}}

groovy

s="s=%s;printf s,s.inspect()";printf s,s.inspect()

evaluate s='char q=39;print"evaluate s=$q$s$q"'

s="s=%c%s%c;printf s,34,s,34";printf s,34,s,34

s='s=%c%s%1$c;printf s,39,s';printf s,39,s

printf _='printf _=%c%s%1$c,39,_',39,_

haskell

main = putStr (s ++ [';',' ','s',' ','=',' '] ++ show s); s = "main = putStr (s ++ [';',' ','s',' ','=',' '] ++ show s)

main = (\s -> putStrLn (s ++ show s)) "main = (\\s -> putStrln (s ++ show s)) "

Parallel

Pool of Workers

Subdivide A Problem To A Pool Of Workers (No Shared Data)

python

import multiprocessing
import itertools

task_input = ["ab", "we", "tfe", "aoj"]

def all_subperms(s):
return set(reduce(
list.__add__,
([''.join(p) for p in itertools.product(s, repeat=r) if p]
for r in xrange(len(s) + 1))))

p = multiprocessing.Pool(len(task_input))
task_output = p.map(all_subperms, task_input)
print map(list, task_output)

fsharp

open System
let input = [| "ab"; "we"; "tfe"; "aoj" |]

/// Computes all permutations of an array
let rec permute = function
| [| |] -> [| [| |] |]
| a ->
a
|> Array.mapi (fun i ai ->
// Take all elements in the array apart from the i.th, compute
// their permutations, then attach element i at the front of each perm
Array.sub a 0 i
|> Array.append (Array.sub a (i + 1) (a.Length - i - 1))
|> permute
|> Array.map (fun perm -> Array.append [| ai |] perm)
)
|> Array.concat

/// Computes all permutations of a string
let permuteString (s: string) =
s.ToCharArray()
|> permute
|> Array.map (fun p -> new String(p))

let output =
input
|> Array.map (fun word -> async { return (permuteString word) })
|> Async.Parallel
|> Async.RunSynchronously

// like the Java and Groovy solutions, does not duplicate letters
open System
open System.Threading.Tasks

let input = [| "ab"; "we"; "tfe"; "aoj" |]

let factorial n =
seq { 1 .. n } |> Seq.reduce (*)

let swap (arr:'a[]) i j =
[| for k = 0 to arr.Length - 1 do
yield if k = i then arr.[j] elif k = j then arr.[i] else arr.[k] |]

let rec permutation (k:int,j:int) (r:'a[]) =
if j = (r.Length + 1) then r
else permutation (k/j+1, j+1) (swap r (j-1) (k%j))

let permutations (source:'a[]) = seq {
for k = 0 to (factorial source.Length) - 1 do
yield permutation (k,2) source
}

let permute (word:string) =
let letters = word.ToCharArray()
permutations letters
|> Seq.map (fun chars -> String(chars))
|> Array.ofSeq

let tasks =
input |> Array.map (fun word -> Task.Factory.StartNew(fun () -> permute word))

let taskResult (t:Task<_>) =
t.Result

let output = Task.Factory.ContinueWhenAll(tasks, fun ts -> Array.map taskResult ts).Result

fantom

using concurrent

// as per Java answer, doesn't duplicate chars from input string, i.e. no 'aa'
const class PermGen : Actor
{
new make(ActorPool pool) : super(pool) {}

Void permutations(Str prefix, Str w, Str[] pset)
{
n := w.size
if (n == 0)
{
if (!pset.contains(prefix))
pset.add(prefix)
return
}
n.times { permutations(prefix + w[it..it], w[0..<it] + w[it+1..<n], pset) }
}

override Obj? receive(Obj? msg)
{
Str word := msg
wordSubPerm := Str[,]
for (Int i := 0; i < word.size; i++)
for (Int j := i; j < word.size; j++)
permutations("", word[i..j], wordSubPerm)
return wordSubPerm
}
}

class SolutionXX
{
static Void main()
{
pool := ActorPool() { maxThreads = 8 }
futures := Future[,]
["ab", "we", "tfe", "aoj"].each { futures.add(PermGen(pool).send(it)) }
futures.each { echo(it.get) }
}
}

groovy

// as per Java answer, doesn't duplicate chars from input string, i.e. no 'aa'
def ans = [].asSynchronized()
def words = ["ab", "we", "tfe", "aoj"]
def threads = []

void permutations(String prefix, String w, Set<String> permSet) {
int n = w.size()
if (!n) permSet << prefix
else n.times { i ->
permutations(prefix + w[i], w[0..<i] + w[i+1..<n], permSet)
}
}

words.each { word ->
def t = Thread.start {
def wordAns = [] as Set
for (int i = 0; i < word.size(); i++)
for (int j = i + 1; j <= word.size(); j++)
permutations("", word[i..<j], wordAns)
ans << wordAns
}
threads << t
}

threads.each{ it.join() }
println ans

// as per Java answer, doesn't duplicate chars from input string, i.e. no 'aa'
def ans = [].asSynchronized()
def words = ["ab", "we", "tfe", "aoj"]

void permutations(String prefix, String w, Set<String> permSet) {
int n = w.size()
if (!n) permSet << prefix
else n.times { i ->
permutations(prefix + w[i], w[0..<i] + w[i+1..<n], permSet)
}
}

withParallelizer {
words.eachParallel { word ->
def wordAns = [] as Set
for (int i = 0; i < word.size(); i++)
for (int j = i + 1; j <= word.size(); j++)
permutations("", word[i..<j], wordAns)
ans << wordAns
}
}

println ans

haskell

import Control.Parallel
import Control.Parallel.Strategies

allPerms xs = do
x <- [1 .. length xs]
sequence (replicate x xs)

result = parMap rdeepseq allPerms ["ab", "we", "tfe", "aoj"]

main = print $ concat result

{-
Compile with -threaded
-}

Subdivide A Problem To A Pool Of Workers (Shared Data)

Take a hard to compute problem and split it up between multiple worker threads. In your solution, try to fully utilize available cores or processors. (I'm looking at you, Python!)

Note: In this question, there should be a need for shared state between worker threads while the problem is being solved.

Example:

-Conway Game of Life-

From Wikipedia:

The universe of the Game of Life is an infinite two-dimensional orthogonal grid of square cells, each of which is in one of two possible states, live or dead. Every cell interacts with its eight neighbors, which are the cells that are directly horizontally, vertically, or diagonally adjacent. At each step in time, the following transitions occur:

1. Any live cell with fewer than two live neighbours dies, as if caused by underpopulation.
2. Any live cell with more than three live neighbours dies, as if by overcrowding.
3. Any live cell with two or three live neighbours lives on to the next generation.
4. Any dead cell with exactly three live neighbours becomes a live cell.

The initial pattern constitutes the seed of the system. The first generation is created by applying the above rules simultaneously to every cell in the seed—births and deaths happen simultaneously, and the discrete moment at which this happens is sometimes called a tick (in other words, each generation is a pure function of the one before). The rules continue to be applied repeatedly to create further generations.

--However, for our purposes, we will assign a size to the game "board": 2^k * 2^k . That is, the board should be easy to subdivide.

Notice that in this problem, at each step or "tick", each thread/process will need to share data with its neighborhood.

fsharp

/// Represents a single cell, along with the basic transition rule
type State =
| Alive
| Dead
member this.Transition numLiveNeighbors =
match this with
| Alive when numLiveNeighbors < 2 -> Dead
| Alive when numLiveNeighbors > 3 -> Dead
| Alive -> Alive
| Dead when numLiveNeighbors = 3 -> Alive
| _ -> Dead
member this.ToChar() =
match this with
| Alive -> '*'
| Dead -> ' '
static member OfChar = function
| ' ' -> Dead
| _ -> Alive

type Board (board: State[,]) =
member this.Item
with get(i,j) = board.[i,j]
and set (i,j) v = board.[i,j] <- v
member this.Length1 = Array2D.length1 board
member this.Length2 = Array2D.length2 board
member this.CountLiveNeighbors(i, j) =
[| (-1,-1); (-1,0); (-1,1); (0,-1); (0,1); (1,-1); (1,0); (1,1) |]
|> Array.sumBy (fun (di,dj) ->
if (i + di) > 0 && (i + di) < this.Length1 && (j+dj) > 0 && (j+dj) < this.Length2 then
match board.[i+di,j+dj] with
| Alive -> 1
| _ -> 0
else
0
)
member this.Clone() = Board(Array2D.copy board)
override this.ToString() =
[|
for i in 0 .. this.Length1 - 1 do
let l = [| for j in 0 .. this.Length2 - 1 do yield board.[i,j].ToChar() |]
yield new String(l)
|]
|> String.concat ("\n")
static member OfString (s: string) =
let states =
s.Split('\n')
|> Array.map (fun line -> line.ToCharArray() |> Array.map State.OfChar)
Board (Array2D.init states.Length states.[0].Length (fun i j -> states.[i].[j]))
static member Update (inboard: Board) =
let outboard = inboard.Clone()
let Worker (i1,i2,j1,j2) =
for i in i1 .. i2 do
for j in j1 .. j2 do
outboard.[i,j] <-
inboard.CountLiveNeighbors(i, j)
|> inboard.[i,j].Transition
let N1 = inboard.Length1 / 2
let N2 = inboard.Length2 / 2
[| (0,N1,0,N2); (N1+1,inboard.Length1-1,0,N2); (0,N1,N2+1,inboard.Length2-1); (N1+1,inboard.Length1-1,N2+1,inboard.Length2-1) |]
|> Array.map (fun bounds -> async { Worker bounds})
|> Async.Parallel
|> Async.RunSynchronously
|> ignore
outboard

let blinker = " \n * \n * \n * \n " |> Board.OfString

do
let after1cycles =
blinker
|> Board.Update
let after3cycles =
after1cycles
|> Board.Update
|> Board.Update
printfn "%s" (after3cycles.ToString())

groovy

// some crude assumptions made for size and amount of parallelism
enum State { ALIVE, DEAD }
import static State.*

seed = '''\
* *
** **
** *
*
**
***
**
* \
'''

def computeNextGen(inboard, outboard, n) {
// crudely split into 4 chunks but could be smarter if we wanted
int half = n/2
def t1 = Thread.start { computeNextGen(inboard, outboard, n, 0, half, 0, half) }
def t2 = Thread.start { computeNextGen(inboard, outboard, n, 0, half, half, n) }
def t3 = Thread.start { computeNextGen(inboard, outboard, n, half, n, 0, half) }
def t4 = Thread.start { computeNextGen(inboard, outboard, n, half, n, half, n) }
[t1, t2, t3, t4].each{ it.join() }
}

def computeNextGen(inboard, outboard, n, minx, maxx, miny, maxy) {
for (int i = minx; i < maxx; i++)
for (int j = 0; j < maxy; j++)
if (i == 0 || i == n-1 || j == 0 || j == n-1)
outboard[i][j] = DEAD
for (int i = minx; i < maxx; i++) {
for (int j = miny; j < maxy; j++) {
if (i == 0 || i == n-1 || j == 0 || j == n-1)
continue
int count = 0
[[-1, 0, 1], [-1, 0, 1]].combinations().each{ dx, dy ->
if ((dx || dy) && inboard[i+dx][j+dy] == ALIVE) count++
}
switch(count) {
case {count == 3}:
case {inboard[i][j] == ALIVE && count == 2}:
outboard[i][j] = ALIVE; break
default:
outboard[i][j] = DEAD
}
}
}
}

void printBoard(board) {
println '--------'
println board*.collect{ it == DEAD ? ' ' : '*' }*.join().join('\n')
}

void initBoard(seed, board) {
def row = 0
seed.readLines().each { line ->
def col = 0
line.each { ch ->
board[row][col++] = ch == '*' ? ALIVE : DEAD
}
row++
}
}

def N = 8
def NUM_CYCLES = 3
def board1 = new State[N][N]
def board2 = new State[N][N]
initBoard(seed, board1)
NUM_CYCLES.times {
computeNextGen board1, board2, N
printBoard board2
computeNextGen board2, board1, N
printBoard board1
}

Threads

Create a multithreaded "Hello World"

Create a program which outputs the string "Hello World" to the console, multiple times, using separate threads or processes.

Example:

-Output-

Thread one says Hello World!
Thread two says Hello World!
Thread four says Hello World!
Thread three says Hello World!

-Notice that the threads can print in any order.

python

#!/usr/bin/python
from threading import Thread
Nthread = ['one','two','three','four']
def ThreadSpeaks(number):
print "Thread", number, "says Hello World!"
if __name__ == "__main__":
for n in range(0,len(Nthread)):
th =Thread(target=ThreadSpeaks, args=(Nthread[n],))
th.start()

fsharp

let mappedString =
["Thread one says Hello World!";
"Thread two says Hello World!";
"Thread four says Hello World!";
"Thread three says Hello World!"]
|> Seq.map (fun str -> async { printfn "%s" str })

Async.RunSynchronously (Async.Parallel mappedString)

fantom

pool := ActorPool()
["one", "two", "three", "four"].each
{
a := Actor(pool) |Str name| { echo("Thread $name says Hello World!") }
a.send(it)
}

groovy

["one","two","three","four"].each { tid ->
Thread.start {
println "Thread $tid says Hello World!"
}
}

import static groovyx.gpars.Parallelizer.*
withParallelizer {
["one","two","three","four"].eachParallel {
println "Thread $it says Hello World!"
}
}

haskell

mapM_ (\x -> forkIO (putStrLn ("Thread " ++ x ++ " says Hello World!"))) ["one", "two", "three", "four"]

Create read/write lock on a shared resource.

Create multiple threads or processes who are either readers or writers. There should be more readers then writers.

(From Wikipedia):

Multiple readers can read the data in parallel but an exclusive lock is needed while writing the data. When a writer is writing the data, readers will be blocked until the writer is finished writing.

Example:

-Output-

Thread one says that the value is 8.
Thread three says that the value is 8.
Thread two is taking the lock.
Thread four tried to read the value, but could not.
Thread five tried to write to the value, but could not.
Thread two is changing the value to 9.
Thread two is releasing the lock.
Thread four says that the value is 9.
...

--Notice that when a needed resource is locked, a thread can set a timer and try again in the future, or wait to be notified that the resource is no longer locked.

python

#!/usr/bin/python
from threading import Thread, Lock
import time
thread_readers = ['one','two','three']
thread_writer = ['four','five']
lock = Lock()
value = 0

def Threadread(number):
global value
while True:
if lock.acquire(False):
print "Thread", number, "is taking the lock"
value += 1
print "Thread", number, "is changing the value to", value
print "Thread", number, "is releasing the lock."
lock.release()
else:
print "Thread", number, "tried to write to the value, but could not."
def Threadwrite(number):
global value
while True:
if lock.acquire(False):
print "Thread", number ,"four says that the value is", value
else:
print "Thread", number ,"tried to read the value, but could not."
if __name__ == "__main__":
for n in range(0,len(thread_readers)):
th =Thread(target=Threadread, args=(thread_readers[n],))
th.start()
for n in range(0,len(thread_writer)):
th =Thread(target=Threadwrite, args=(thread_writer[n],))
th.start()

fsharp

open System.Threading
let lock = new ReaderWriterLock()
let mutable value = 0
let lockTimeout = 1

let ReaderThread t =
let random = new System.Random()
for i in 0 .. 100 do
try
lock.AcquireReaderLock(lockTimeout)
try
printfn "Thread %i says that the value is %i" t value
finally
lock.ReleaseReaderLock()
with _ ->
printfn "Thread %i tried to read the value, but could not (timeout)." t
Thread.Sleep(random.Next(50))

let WriterThread t =
let random = new System.Random()
for i in 0 .. 100 do
try
lock.AcquireWriterLock(lockTimeout)
try
value <- random.Next(10)
printfn "Thread %i is changing the value to %i" t value
Thread.MemoryBarrier()
finally
lock.ReleaseWriterLock()
printfn "Thread %i is releasing the lock." t
with _ ->
printfn "Thread %i tried to write the value, but could not (timeout)." t
Thread.Sleep(random.Next(50))

[| 0 .. 20 |]
|> Array.iter (fun t ->
async {
if t % 3 = 0 then
WriterThread t
else
ReaderThread t
}
|> Async.Start
)

groovy

def lock = new ReentrantLock()
Integer value = 8

20.times { i ->
if (i % 3 == 0) {
Thread.start {
if (!lock.tryLock()) {
println "Thread " + i + " tried to write the value, but could not."
lock.lock()
}
value = (int) (Math.random() * 10)
println "Thread " + i + " is changing the value to " + value
lock.unlock()
println "Thread " + i + " is releasing the lock."
}
} else {
Thread.start {
if (!lock.tryLock()) {
println "Thread " + i + " tried to read the value, but could not."
lock.lock()
}
println "Thread " + i + " says that the value is " + value + "."
lock.unlock()
}
}
}

Separate user interaction and computation.

Allow your program to accept user interaction while conducting a long running computation.

Example:

Hello user! Please input a string to permute: (input thread)
abcdef
Passing on abcdef... (input thread)
Please input another string to permute: (input thread)
lol
Passing on lol... (input thread)
Done Work On abcdef! (worker thread)
["abcdef", "abcefd", ... ] (worker thread)
Please input another string to permute: (input thread)
EXIT
Quitting, I

'll let my worker thread know... (input thread)

We'

re quitting! Alright! (worker thread)

--Notice, that this could be accomplished on the command line or within a GUI. The point is that computation and user interaction should take place on separate threads of control.

fsharp

open System

/// Computes all permutations of an array
let rec permute = function
| [| |] -> [| [| |] |]
| a ->
a
|> Array.mapi (fun i ai ->
Array.sub a 0 i
|> Array.append (Array.sub a (i + 1) (a.Length - i - 1))
|> permute
|> Array.map (fun perm -> Array.append [| ai |] perm)
)
|> Array.concat

/// Computes all permutations of a string
let permuteString (s: string) =
s.ToCharArray()
|> permute
|> Array.map (fun p -> new String(p))

type PermuteMessage =
| PermuteString of string
| Cancel

let mailbox = new MailboxProcessor<PermuteMessage>(fun inbox ->
let rec loop() =
async {
let! msg = inbox.Receive()
match msg with
| PermuteString s ->
printfn "[Worker] Starting to work on %s" s
let p = permuteString s
printfn "[Worker] Done my work on %s" s
let firstElems =
if s.Length > 4 then
let first = p |> Seq.truncate 4 |> Seq.toArray
String.Join(", ", first) + ", ..."
else
String.Join(", ", p)
printfn "[Worker] Result is %s" firstElems
return! loop()
| Cancel ->
printfn "[Worker] Nuff done, I'm quitting!"
return ()
}
loop()
)

do
printfn "[Input] Setting up worker."
mailbox.Start()
let loop = ref true
while !loop do
printfn "[Input] Please enter a word, or EXIT to exit"
let s = Console.ReadLine()
match s with
| "EXIT" ->
printfn "[Input] Sending worker the cancellation notice."
mailbox.Post(Cancel)
loop := false
| _ ->
printfn "[Input] Sending task to the worker."
mailbox.Post(PermuteString s)

fantom

using concurrent
class Main
{
static Void main()
{
worker := Actor(ActorPool()) |Str s|
{
result := permute(s.chars).map { Str.fromChars(it) }
echo("Done Work On $s!")
echo(result)
}

Env.cur.out.writeChars("Hello, user! Please input a string to permute: ").flush
Env.cur.in.eachLine |line| {
echo("Passing on $line ...")
worker.send(line)
Env.cur.out.writeChars("Please input another string to permute: ").flush
}
}

static Obj[][] permute(Obj[] list, Obj[] prefix := [,])
{
list.isEmpty ?
[prefix] :
list.reduce([,]) |Obj[] r, Obj item, Int i -> Obj[]| {
r.addAll(permute(list.dup { removeAt(i) }, prefix.dup.add(item)))
}
}
}

groovy

def threads = new ConcurrentLinkedQueue<Thread>()

void permutations(String prefix, String w, Set<String> permSet) {
int n = w.size()
if (!n) permSet << prefix
else n.times { i ->
permutations(prefix + w[i], w[0..<i] + w[i+1..<n], permSet)
}
}

println 'Welcome to the parallel permuter'
System.in.withReader { r ->
while (true) {
print 'Enter word:'
def word = r.readLine()
if (word == 'EXIT') {
while (!threads.isEmpty())
threads.poll().stop(new ThreadDeath())
break
} else
threads << Thread.start {
try {
def wordAns = [] as Set
for (int i = 0; i < word.size(); i++)
for (int j = i + 1; j <= word.size(); j++)
permutations("", word[i..<j], wordAns)
println '\nAnswer:' + wordAns
print 'Enter word:'
} catch (ThreadDeath td) {
println 'Thread aborted!'
}
}
}
}

i18n

i18n-helloworld

Put a internationalizate of HelloWorld program

Set locale to "es" (spanish) and provide a program that changes outputs ("Helloworld") depending of locale.

In pseudocode:

Void main ()

{



Locale.set("es")



print.translate("Helloworld, Locale.get)



}

fantom

Locale("es).use
class Foo { Void main() { echo(#Foo.pod.locale("hello world!")) } }

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href="http://fr.weddingdressescompany.com/robes-de-mariée-c-1.html ">Robes de Mariée</a> :: <br/> <a href="http://fr.weddingdressescompany.com/robes-de-mariée-robe-de-mariée-sexy-c-1_30.html ">Robe de mariée sexy</a> :: <br/>Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes<br/></div> <br/><br/> <br/> <br/> <br/><br/> <br/><br/> <br/> <br/><div class="centerColumn" id="productGeneral "> <br/> <br/> <br/><h1 id="productName" class="productGeneral ">Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes</h1> <br/> <br/><form name="cart_quantity" action="http://fr.weddingdressescompany.com/low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html?action=add_product&number_of_uploads=0" method="post" enctype="multipart/form-data "><br/> <br/><div style="float:left; "> <br/> <br/> <br/> <br/><div id="productMainImage" class="centeredContent back "> <br/> <br/><noscript> <br/><a href="http://fr.weddingdressescompany.com/index.php?main_page=popup_image&pID=456" target="_blank "> <a href="http://fr.weddingdressescompany.com/low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html" ><img src="http://fr.weddingdressescompany.com/images/weddingdress/sxw0018.jpg" alt="Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes" title=" Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes " width="240" height="329" /></a><br /><span class="imgLink ">Agrandir l'</code>image<<code>/span></</code>a><<code>/noscript> <br/></</code>div> <br/> <br/> <div id=<code>"productAdditionalImages "</code>> <br/> <div id=<code>"dfse "</code>><<code>/div> <br/> <div class="centerBoxContent "> <br/> <br/> <br/> <div class="additionalImages centeredContent back" style="width:100%; "><br/> <br/> <noscript><a href="http:/fr.weddingdressescompany.com/</code>low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html<code>" target="</code>_blank <code>"> <a href="</code>http:<code>//</code>fr.weddingdressescompany.com<code>/low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html" ><img src="http:/fr.weddingdressescompany.com/</code>images<code>/weddingdress/</code>sxw0018_01.jpg<code>" alt="</code>Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes<code>" title="</code> Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes <code>" width="</code>130<code>" height="</code>174<code>" style="</code>position:relative<code>" onmouseover="</code>showtrail(<code>'images/weddingdress//sxw0018_01.jpg'</code>,<code>'Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes'</code>,130,173,243,325,this,0,0,130,173);<code>" onmouseout="</code>hidetrail();<code>" /></a><br /><span class="</code>imgLinkAdditional <code>">Agrandir l'image</span></a></noscript></div><br/><br class="</code>clearBoth<code>" /> <br/> <br/></div></div> <br/> <br/></div> <br/> <br/><div style="</code>width:348px;float:right;<code>" id='pb-left-column'> <br/> <br/><span id="</code>productPrices<code>" class="</code>productGeneral <code>"> <br/>Price: <br/><span class="</code>normalprice <code>">$218.77 </span> <span class="</code>productSpecialPrice <code>">$175.01</span><span class="</code>productPriceDiscount <code>"><br />Economie : 20%</span></span> <br/><div class="</code>model_number<code>" style="</code>height:14px;padding-top:7px <code>"><h4 style="</code>float: left;color:black; <code>"><label class="</code>class <code>">Modèle : </label></h4><div style="</code>float: left;margin-top:5px;margin-left:6px; <code>"><span style="</code>font-size:12px;height:20px;color:black; <code>">Mall3411</span></div><br/></div> <br/> <br/> <br/> <br/> <br/> <br/><div id="</code>productAttributes <code>"> <br/><h1 style='margin-bottom: 10px;'>Step 1 - Choose Options:</h1> <br/> <br/> <br/><div class="</code>wrapperAttribsOptions <code>"> <br/><h4 class="</code>optionName back <code>"><label>Colors</label></h4> <br/><div class="</code>back <code>"><br/><select name="</code>id<code>[8]</code><code>" id="</code>attrib-8 <code>"><br/> <option value="</code>46 <code>">1</option><br/> <option value="</code>52 <code>">10</option><br/> <option value="</code>53 <code>">12</option><br/> <option value="</code>54 <code>">16</option><br/> <option value="</code>55 <code>">17</option><br/> <option value="</code>56 <code>">18</option><br/> <option value="</code>47 <code>">2</option><br/> <option value="</code>57 <code>">20</option><br/> <option value="</code>58 <code>">21</option><br/> <option value="</code>59 <code>">23</option><br/> <option value="</code>60 <code>">26</option><br/> <option value="</code>61 <code>">27</option><br/> <option value="</code>62 <code>">28</option><br/> <option value="</code>63 <code>">29</option><br/> <option value="</code>64 <code>">30</option><br/> <option value="</code>65 <code>">31</option><br/> <option value="</code>66 <code>">33</option><br/> <option value="</code>67 <code>">35</option><br/> <option value="</code>68 <code>">36</option><br/> <option value="</code>69 <code>">37</option><br/> <option value="</code>48 <code>">4</option><br/> <option value="</code>70 <code>">41</option><br/> <option value="</code>71 <code>">43</option><br/> <option value="</code>72 <code>">44</option><br/> <option value="</code>73 <code>">47</option><br/> <option value="</code>74 <code>">48</option><br/> <option value="</code>75 <code>">49</option><br/> <option value="</code>49 <code>">5</option><br/> <option value="</code>76 <code>">51</option><br/> <option value="</code>77 <code>">54</option><br/> <option value="</code>78 <code>">56</option><br/> <option value="</code>79 <code>">60</option><br/> <option value="</code>80 <code>">61</option><br/> <option value="</code>81 <code>">66</option><br/> <option value="</code>82 <code>">67</option><br/> <option value="</code>83 <code>">69</option><br/> <option value="</code>84 <code>">73</option><br/> <option value="</code>85 <code>">77</option><br/> <option value="</code>86 <code>">78</option><br/> <option value="</code>87 <code>">79</option><br/> <option value="</code>50 <code>">8</option><br/> <option value="</code>51 <code>">9</option><br/> <option value="</code>27 <code>">Ivory</option><br/> <option value="</code>26 <code>">Same As Picture</option><br/> <option value="</code>28 <code>">White</option><br/></select><br/><br/></div> <br/><br class="</code>clearBoth<code>" /> <br/></div> <br/> <br/> <br/> <br/> <br/><br/><br class="</code>clearBoth<code>" /> <br/> <br/><div class="</code>wrapperAttribsOptions <code>"> <br/><h4 class="</code>optionName back <code>"><label>Sizes</label></h4> <br/><div class="</code>back <code>"><br/><select name="</code>id<code>[9]</code><code>" id="</code>attrib-9 <code>"><br/> <option value="</code>29 <code>">US 10 / UK 12 / EUR 40</option><br/> <option value="</code>30 <code>">US 12 / UK 14 /EUR 42</option><br/> <option value="</code>31 <code>">US 14 / UK 16 /EUR 44</option><br/> <option value="</code>32 <code>">US 16 / UK 18 /EUR 46</option><br/> <option value="</code>33 <code>">US 18 / UK 20 /EUR 48</option><br/> <option value="</code>34 <code>">US 2 / UK 4 /EUR 32</option><br/> <option value="</code>35 <code>">US 20 / UK 22 /EUR 50</option><br/> <option value="</code>36 <code>">US 22 / UK 24 /EUR 52</option><br/> <option value="</code>37 <code>">US 24 / UK 26 /EUR 54</option><br/> <option value="</code>38 <code>">US 26 / UK 28 /EUR 56</option><br/> <option value="</code>39 <code>">US 28 / UK 30 /EUR 58</option><br/> <option value="</code>40 <code>">US 4 / UK 6 /EUR 34</option><br/> <option value="</code>41 <code>">US 6 / UK 8 /EUR 36</option><br/> <option value="</code>42 <code>">US 8 / UK 10 /EUR 38</option><br/></select><br/><br/></div> <br/><br class="</code>clearBoth<code>" /> <br/></div> <br/> <br/> <br/> <br/> <br/><br/><br class="</code>clearBoth<code>" /> <br/> <br/><div class="</code>wrapperAttribsOptions <code>"> <br/><h4 class="</code>optionName back <code>"><label>Back style</label></h4> <br/><div class="</code>back <code>"><br/><select name="</code>id<code>[10]</code><code>" id="</code>attrib-10 <code>"><br/> <option value="</code>44 <code>">Lace Up</option><br/> <option value="</code>43 <code>">Same As Picture</option><br/> <option value="</code>45 <code>">Zip Up</option><br/></select><br/><br/></div> <br/><br class="</code>clearBoth<code>" /> <br/></div> <br/> <br/> <br/> <br/> <br/><br/><br class="</code>clearBoth<code>" /> <br/> <br/><div style="</code>padding-bottom:5px; <code>"><a href="</code>http:<code>//</code>fr.weddingdressescompany.com<code>/size.html" style="color:black;font-weight:bold;text-decoration:underline; color:#FF0000;" target="_blank ">Size Chart</</code>a> | <a href=<code>"http://fr.weddingdressescompany.com/color.html"</code> style=<code>"color:black;font-weight:bold;text-decoration:underline;color:#FF0000;"</code> target=<code>"_blank "</code>>Color Chart<<code>/a></</code>div> <br/> <br/> <br/><<code>/div> <br/><div id='quantity_cart'> <br/><h1>Step 2 - Choose Quantity:</</code>h1> <br/> <br/> <br/> <div class=<code>"wrapperAttribsOptions"</code> style=<code>"height:14px;padding-top:7px "</code>><h4 style=<code>"float:left; "</code>><label class=<code>"attribsInput "</code>>Quantity :<<code>/label></</code>h4><div style=<code>"float:left; "</code>><input type=<code>"text"</code> class=<code>"text"</code> id=<code>"quantity_wanted"</code> name=<code>"cart_quantity"</code> value=<code>"1"</code> maxlength=<code>"6"</code> size=<code>"4"</code> <code>/></</code>div><<code>/div> <br/> <br class="clearBoth "> <br/> <h1 style='margin-bottom: 10px;'>Step 3 - Add to cart:</</code>h1> <br/> <p id=<code>'add_to_cart'</code> class=<code>'buttons_bottom_block'</code>> <br/> <input type=<code>"hidden"</code> name=<code>"products_id"</code> value=<code>"456"</code> <code>/><input type="image" src="http:/fr.weddingdressescompany.com/</code>includes<code>/templates/</code>weddingdress-7<code>/buttons/</code>french<code>/button_in_cart.gif" alt="ajouter au panier" title=" ajouter au panier " /</code>> <<code>/p> <br/> <br/></</code>div> <br/><div> <br/> <div class=<code>'safe_onlinechat'</code>> <br/> <div class=<code>'safe_ssl'</code>> <br/> <a target=<code>'_blank'</code> href=<code>'msnim:chat?contact=myonlineservice@msn.com'</code> style=<code>"float:left; "</code>><img src=<code>'http://fr.weddingdressescompany.com/banner/msn.jpg'</code>><<code>/a> <br/> <a target='_blank' href='callto:/meganfox59'><img border=0 align='absmiddle' src='http:/fr.weddingdressescompany.com/</code>banner<code>/skype.jpg' style="float:left; "></</code>a> <br/> <<code>/div> <br/> </</code>div> <br/> <br/><<code>/div> <br/> <br/></</code>div> <br/> <br/> <br/><br class=<code>"clearBoth"</code> <code>/> <br/><div id='descript_menu'> <br/><ul id='more_info_tabs' class='idTabs idTabsShort'> <br/> <li><a onclick='dissplay_descript(this);' style='cursor:pointer;'>Details</</code>span><<code>/a></</code>li> <br/> <li><a onclick=<code>'displaysize(this);'</code>style=<code>'cursor:pointer;'</code>>SIZE & COLOR CHART<<code>/a></</code>li> <br/> <li><a onclick=<code>'dissplay_return(this);'</code>style=<code>'cursor:pointer;'</code>>Shipping<<code>/a></</code>li> <br/> <li><a onclick=<code>'measure(this);'</code>style=<code>'cursor:pointer;'</code>>How to Measure<<code>/a></</code>li> <br/><<code>/ul> <br/><script> <br/> function displaysize(obj){ <br/> var measure = document.getElementById('idTabMeasure'); <br/> var idTabtwo = document.getElementById('idTabtwo'); <br/> var shipping_return = document.getElementById('tab_3'); <br/> var descript = document.getElementById('productDescription'); <br/> <br/> idTabtwo.setAttribute('class','block_hidden_only_for_screen'); <br/> descript.setAttribute('class','display'); <br/> shipping_return.setAttribute('class','display'); <br/> measure.setAttribute('class','display'); <br/> } <br/> function dissplay_descript(obj){ <br/> var measure = document.getElementById('idTabMeasure'); <br/> var descript = document.getElementById('productDescription'); <br/> var idTabtwo = document.getElementById('idTabtwo'); <br/> var shipping_return = document.getElementById('tab_3'); <br/> descript.setAttribute('class','block_hidden_only_for_screen'); <br/> idTabtwo.setAttribute('class','display'); <br/> shipping_return.setAttribute('class','display'); <br/> measure.setAttribute('class','display'); <br/> <br/> } <br/> function dissplay_return(obj){ <br/> var measure = document.getElementById('idTabMeasure'); <br/> var shipping_return = document.getElementById('tab_3'); <br/> var descript = document.getElementById('productDescription'); <br/> var idTabtwo = document.getElementById('idTabtwo'); <br/> shipping_return.setAttribute('class','block_hidden_only_for_screen'); <br/> idTabtwo.setAttribute('class','display'); <br/> descript.setAttribute('class','display'); <br/> measure.setAttribute('class','display'); <br/> <br/> } <br/> function measure(obj){ <br/> var measure = document.getElementById('idTabMeasure'); <br/> var shipping_return = document.getElementById('tab_3'); <br/> var descript = document.getElementById('productDescription'); <br/> var idTabtwo = document.getElementById('idTabtwo'); <br/> measure.setAttribute('class','block_hidden_only_for_screen'); <br/> idTabtwo.setAttribute('class','display'); <br/> descript.setAttribute('class','display'); <br/> shipping_return.setAttribute('class','display'); <br/> <br/> <br/> <br/> } <br/></</code>script> <br/><div id=<code>'more_info_sheets'</code> class=<code>'sheets align_justify'</code>> <br/> <br/><div id=<code>"productDescription"</code> class=<code>'displayblock'</code>>Nom de l<code>'article:</div> <br/> <br/><div id='</code>idTabtwo<code>' class='</code>display<code>'> <br/> <div class='</code>SizeKind<code>'> <br/> <div style='</code>background-attachment: scroll; background-image: none; background-position: 0pt 0pt; background-repeat: repeat; border-bottom: 1px solid rgb(238, 238, 238); margin-bottom: 10px; padding-bottom: 10px; padding-top: 10px; text-align: center;<code>'> <br/> <p style='</code>font-weight: bold; color: rgb(178, 30, 54); font-size: 14px;<code>'>Please choose your favorite color from the palette</p> <br/> <a id='</code>single_3<code>' href='</code>http:<code>//</code>fr.weddingdressescompany.com<code>/image/</code>img_ColorCard.jpg<code>'><img src='</code>http:<code>//</code>fr.weddingdressescompany.com<code>/image/</code>img_ColorCard.jpg<code>' alt='</code>wedding dress card palette<code>' width='</code>720<code>'></a> <br/> <p style='</code>text-align: left;<code>'><span style='</code>color: rgb(255, 0, 0);<code>'>Notice:</span>Since computer screens have chromatic aberration, especially between CRT screen and LCD screen, we can not guarantee the color of the dress you get will be 100% similar as the color chart. And also different fabrics will show different color degree on the same color. So we can not accept any returned dress for sake of color. Please kindly understand us.</p> <br/> </div> <br/> <div style='</code>background-attachment: scroll; background-image: none; background-position: 0pt 0pt; background-repeat: repeat; border-bottom: 1px solid rgb(238, 238, 238); margin-bottom: 20px; padding-bottom: 20px; padding-top: 10px; text-align: center;<code>'> <br/> <p style='</code>font-weight: bold; color: rgb(178, 30, 54); font-size: 14px;<code>'> Please choose your size</p> <br/> <table cellspacing="0" cellpadding="0 "> <br/> <tbody> <br/> <tr> <br/> <th colspan="15 ">Standard size (in centimeter)</th> <br/> </tr> <br/> <tr> <br/> <br/> <th>US size no</th> <br/> <td>2</td> <br/> <td>4</td> <br/> <td>6</td> <br/> <td>8</td> <br/> <td>10</td> <br/> <br/> <td>12</td> <br/> <td>14</td> <br/> <td>16</td> <br/> <td>18</td> <br/> <td>20</td> <br/> <td>22</td> <br/> <br/> <td>24</td> <br/> <td>26</td> <br/> <td>28</td> <br/> </tr> <br/> <tr> <br/> <th>EUR size no</th> <br/> <td>32</td> <br/> <br/> <td>34</td> <br/> <td>36</td> <br/> <td>38</td> <br/> <td>40</td> <br/> <td>42</td> <br/> <td>44</td> <br/> <br/> <td>46</td> <br/> <td>48</td> <br/> <td>50</td> <br/> <td>52</td> <br/> <td>54</td> <br/> <td>56</td> <br/> <br/> <td>58</td> <br/> </tr> <br/> <tr> <br/> <th>Bust</th> <br/> <td>84</td> <br/> <td>86</td> <br/> <td>89</td> <br/> <br/> <td>91</td> <br/> <td>94</td> <br/> <td>98</td> <br/> <td>102</td> <br/> <td>105</td> <br/> <td>109</td> <br/> <br/> <td>114</td> <br/> <td>119</td> <br/> <td>124</td> <br/> <td>132</td> <br/> <td>142</td> <br/> </tr> <br/> <br/> <tr> <br/> <th>Waist</th> <br/> <td>66</td> <br/> <td>69</td> <br/> <td>71</td> <br/> <td>74</td> <br/> <br/> <td>76</td> <br/> <td>80</td> <br/> <td>84</td> <br/> <td>88</td> <br/> <td>91</td> <br/> <td>96</td> <br/> <br/> <td>102</td> <br/> <td>107</td> <br/> <td>114</td> <br/> <td>124</td> <br/> </tr> <br/> <tr> <br/> <th>Hip</th> <br/> <br/> <td>91</td> <br/> <td>94</td> <br/> <td>97</td> <br/> <td>99</td> <br/> <td>102</td> <br/> <td>105</td> <br/> <br/> <td>109</td> <br/> <td>113</td> <br/> <td>117</td> <br/> <td>122</td> <br/> <td>127</td> <br/> <td>132</td> <br/> <br/> <td>140</td> <br/> <td>150</td> <br/> </tr> <br/> <tr> <br/> <th>Shoulder to floor</th> <br/> <td>150</td> <br/> <td>150</td> <br/> <br/> <td>151</td> <br/> <td>152</td> <br/> <td>152</td> <br/> <td>153</td> <br/> <td>154</td> <br/> <td>154</td> <br/> <br/> <td>155</td> <br/> <td>156</td> <br/> <td>156</td> <br/> <td>156</td> <br/> <td>156</td> <br/> <td>156</td> <br/> <br/> </tr> <br/> </tbody> <br/></table> <br/><p> </p> <br/><table cellspacing="0" cellpadding="0 "> <br/> <tbody> <br/> <tr> <br/> <th colspan="15 ">Standard size (in inches)</th> <br/> </tr> <br/> <br/> <tr> <br/> <th>US size no</th> <br/> <td>2</td> <br/> <td>4</td> <br/> <td>6</td> <br/> <td>8</td> <br/> <br/> <td>10</td> <br/> <td>12</td> <br/> <td>14</td> <br/> <td>16</td> <br/> <td>18</td> <br/> <td>20</td> <br/> <br/> <td>22</td> <br/> <td>24</td> <br/> <td>26</td> <br/> <td>28</td> <br/> </tr> <br/> <tr> <br/> <th>EUR size no</th> <br/> <br/> <td>32</td> <br/> <td>34</td> <br/> <td>36</td> <br/> <td>38</td> <br/> <td>40</td> <br/> <td>42</td> <br/> <br/> <td>44</td> <br/> <td>46</td> <br/> <td>48</td> <br/> <td>50</td> <br/> <td>52</td> <br/> <td>54</td> <br/> <br/> <td>56</td> <br/> <td>58</td> <br/> </tr> <br/> <tr> <br/> <th>Bust</th> <br/> <td>33</td> <br/> <td>34</td> <br/> <br/> <td>35</td> <br/> <td>36</td> <br/> <td>37</td> <br/> <td>39</td> <br/> <td>40</td> <br/> <td>42</td> <br/> <br/> <td>43</td> <br/> <td>45</td> <br/> <td>47</td> <br/> <td>49</td> <br/> <td>52</td> <br/> <td>56</td> <br/> <br/> </tr> <br/> <tr> <br/> <th>Waist</th> <br/> <td>26</td> <br/> <td>27</td> <br/> <td>28</td> <br/> <td>29</td> <br/> <br/> <td>30</td> <br/> <td>32</td> <br/> <td>33</td> <br/> <td>35</td> <br/> <td>36</td> <br/> <td>38</td> <br/> <br/> <td>40</td> <br/> <td>42</td> <br/> <td>45</td> <br/> <td>49</td> <br/> </tr> <br/> <tr> <br/> <th>Hip</th> <br/> <br/> <td>36</td> <br/> <td>37</td> <br/> <td>38</td> <br/> <td>39</td> <br/> <td>40</td> <br/> <td>42</td> <br/> <br/> <td>43</td> <br/> <td>45</td> <br/> <td>46</td> <br/> <td>48</td> <br/> <td>50</td> <br/> <td>52</td> <br/> <br/> <td>55</td> <br/> <td>59</td> <br/> </tr> <br/> <tr> <br/> <th>Shoulder to floor</th> <br/> <td>59</td> <br/> <td>59</td> <br/> <br/> <td>60</td> <br/> <td>60</td> <br/> <td>60</td> <br/> <td>60</td> <br/> <td>61</td> <br/> <td>61</td> <br/> <br/> <td>61</td> <br/> <td>61</td> <br/> <td>62</td> <br/> <td>62</td> <br/> <td>62</td> <br/> <td>62</td> <br/> <br/> </tr> <br/> </tbody> <br/></table> <br/> <br/> </div> <br/> <br class='</code>clear<code>'> <br/> </div> <br/></div> <br/> <br/> <br/> <div id="tab_3" class='</code>display<code>'> <br/> <br/> <h3>Shipping Time</h3> <br/><p>Total Time=Operation Time + Shipping Time</p> <br/><p>Default operation time is 30 business days from the day you place an order. <br/>We will rush your order within 20 business days and 15 business days if you <br/>choose rush service from the operation time option,and you will pay extra <br/>cost for it.Shipping time varies as: UPS , TNT 2-4 business days, Air Mail(Express) 10 <br/>business days, Air Mail(Normal) 20 business days. Please calculate the total <br/>time carefully before you place the order.</p> <br/><p><i>Note: You can also choose Air Mail(Normal) if package weight is under 2kg.</i></p> <br/> <br/><h3>Return Tips</h3> <br/><p>If any returns, please contact our customer support within 24 hours from the time you receive your gown and fill in the Application for Refund in email. Only products in their original condition will be accepted. We do not accept returns on any custom made order. ALL SALES ARE FINAL for custom made dresses. For mis-shipped items, once confirmation got with us, we will be responsible for item exchange and have full refund returned including shipping fee and handling fee. In principle, any emergency order isnot subject to this return policy and will be denied. Also other merchandise, such as veil ect.</p></div> <br/> <br/><div id="idTabMeasure" style="height:510px;" class='</code>display<code>'> <br/> <div class="tempnr_box "> <br/> <br/> <div class="images_zuo "> <a href="http://fr.weddingdressescompany.com/low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html" ><img width="163" height="479" src="http://fr.weddingdressescompany.com/image/wedding_size.jpg"/></a></div> <br/> <br/> <div class="nr_right "> <br/> <p style="color:#b21e36;font-size:14px;font-style:italic;font-weight:bold; padding-left:0; ">How to Measure</p> <br/> <ul><li><span class="wzys ">A.Bust:</span>Measure Around The Fullest Part Of Your Bust.</li> <br/> <br/> <li><span class="wzys ">B.Waist:</span>Measure Around The Smallest Part Of Your Waistline.</li> <br/> <li><span class="wzys ">C.Hips:</span>Measure Around The Widest Part Of Your Hips.</li> <br/> <li><span class="wzys ">D.Length:</span> Measure From Top Of The Shoulder Through The Nipple To Floor,Including The Height Of <b>Wedding Shoes</b>.</li> <br/> <li><span class="wzys ">E.Under Bust:</span>Measure Around Under Your Bust.</li> <br/> <br/> <li><span class="wzys ">F.Nipple To Nipple:</span> The Measurement Between Your Two Nipples.</li> <br/> <li><span class="wzys ">G.Shoulder To NiPPLE:</span>Measure From Top Of The Shoulder To Nipple.</li> <br/> <li><span class="wzys ">H.Shoulder TO Waist:</span>Measure From Top Of The Shoulder Through The Nipple TO Waist.</li> <br/> <li><span class="wzys ">I.Shoulder To Hips:</span>Measure From Top Of The Shoulder Through The Nipple TO Hips.</li> <br/> <br/> <li><span class="wzys ">J.Shoulder To Shoulder:</span>Measure Your Shoulder Width From The Back.</li> <br/> <li><span class="wzys ">k.Neck:</span>Measure Around The Fullest Part Of Your Neck.</li> <br/> <li><span class="wzys ">L.Biceps:</span>Measure Around The Widest Part Of Your Arm.</li> <br/> <li class="wzys" style="color:#DD0000;font-size:14px;font-weight:bold;padding:5px;text-align:right;border:1px solid #eee; ">Please Measure With Bra and Underwear On.</li> <br/> <li class="wzys" style="font-size:11px;font-weight:bold;text-align:right; ">Remember To Keep The Measuring Tape Comfortably Loose.</li></ul> <br/> <br/> <br class="clear" /> <br/> <div><span style="color:#DD0000; margin-top:10px; ">Notice:</span>1. Please also tell us your "Height with Shoes" on (measured from top head to your wedding shoes'</code> heel).<br> <br/>2. Please remember that wear your Wedding Underwear and your Wedding Shoes.<br> <br/>3.Inches and Centimetersare both available for size, and please tell us if you use inches or centimeters.<br> <br/>4. We suggest you measure yourself by a Professional Tailor. <br> <br/>5. It is very normal to have 3CM measurement error between the sizes you give and the sizes you will receive on your dress. This kind of error can not be accepted for any returns and exchanges. <<code>/div> <br/> <br/> </</code>div> <br/> <br/> <span class=<code>"clear "</code>><<code>/span> <br/> </</code>div> <br/> <<code>/div> <br/> <br/></</code>div> <br/><<code>/div> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br class="clear" /</code>> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/><<code>/form> <br/> <br/></</code>div> <br/><<code>/td> <br/> <br/> <br/></</code>tr> <br/><<code>/table> <br/><br/> <br/> <br/><div id="navSuppWrapper "> <br/> <br/><div id="navSupp "> <br/><ul><li><a href="http:/fr.weddingdressescompany.com/</code>index.php <code>">Accueil</a></li> <br/><li><a href="</code>http:<code>//</code>fr.weddingdressescompany.com<code>/index.php?main_page=shippinginfo ">Frais de port</</code>a><<code>/li> <br/><li><a href="http:/fr.weddingdressescompany.com/</code>index.php?main_page=Wholesale <code>">Vente en 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