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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.

clojure 1.2

(defprotocol IGreeter
(greet [this]))

(deftype Greeter [whom]
IGreeter
(greet [this]
(println (str "Hello, " whom))))

(greet (Greeter. "world"))

clojure

(defn greeter [whom]
{:whom whom})

(defn greet [g]
(println (str "Hello, " (:whom g))))

(greet (greeter "world"))

cpp

class Greeter
{
public:
Greeter(const std::string& whom);
void greet() const;

private:
std::string whom;
};

int main()
{
Greeter* gp = new Greeter("world");
gp->greet();
delete gp;
}

Greeter::Greeter(const std::string& whom) : whom(whom) {}

void Greeter::greet() const
{
std::cout << "Hello, " << whom << std::endl;
}

cpp C++/CLI .NET 2.0

public ref class Greeter
{
public:
Greeter(String^ whom);
void greet();

private:
initonly String^ whom;
};

int main()
{
(gcnew Greeter(L"world"))->greet();
}

Greeter::Greeter(String^ whom) : whom(whom) {}

void Greeter::greet()
{
Console::WriteLine(L"Hello, {0}", whom);
}

csharp

using System;

class Greeter
{
private string name {get;set;}

public void Greet(){
Console.WriteLine("Hello, {0}",name);
}

public Greeter(string name){
this.name = name;
}
}

class Test
{
static void Main()
{
new Greeter("Dante").Greet();
}
}

erlang

Greeter = make_greeter("world!"),
Greeter(greet).

fantom

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

Greeter("world").greet

fsharp

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

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

fsharp

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

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

fsharp

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

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

type Greeter struct {
whom string
}

func (g Greeter) greet() {
fmt.Printf("Hello %s\n", g.whom)
}

func main() {
Greeter{"world"}.greet()
}

groovy

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

groovy

// 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")

java 1.5 or later

class Greeter
{
public Greeter(String whom) { this.whom = whom; }
public void greet() { System.out.printf("Hello, %s\n", whom); }
private String whom;
}

public class Solution381 {
public static void main(String[] args) {
(new Greeter("world")).greet();
}
}

ocaml

class greeter message =
object
method greet = print_endline message
end

let o = new greeter "Hello" in
o#greet

perl

{ package Greeter;
sub new {
my $self = {};
my $type = shift;
$self->{'whom'} = shift;
bless $self, $type;
}

sub greet {
my $self = shift;
print "Hello " . $self->{'whom'} . "!\n";
}
}

my $greeter = Greeter->new("world");
$greeter->greet();

perl

{
package Greeter;

sub new {
my $class = shift;
my $whom = shift or die 'Need a name to greet';
bless \$whom, $class;
}

sub greet {
my $self = shift;
print "Hello $$self!\n";
}
}

my $greeter = Greeter->new("Bob");
$greeter->greet();

php >= php5

class Greeter {
private $whom;
public function __construct($whom) {
$this->whom = $whom;
}
public function greet() {
echo "Hello $this->whom.";
}
}
$g = new Greeter("Giacomo Girolamo");
$g->greet();

python

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

Greeter("world").greet()

ruby

class Greeter
def initialize(whom) @whom = whom end
def greet() puts "Hello, #{@whom}!" end
end

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

scala

class Greeter(whom : String) { def greet() = { printf("Hello %s\n", whom) } }

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

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