langref.org - ruby, erlang, clojure, and fsharp - Maps | Declaration

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Maps

Declaration

Define an initial map

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

ruby

shapes = {'circle'=>1, 'triangle'=>3, 'square'=>4}

ruby

shapes = Hash['circle', 1, 'triangle', 3, 'square', 4]

ruby

shapes = { :circle => 1, :triangle => 3, :square => 4 }

erlang

Map = dict:from_list([{circle, 1}, {triangle, 3}, {square, 4}]),

erlang

Map0 = dict:new(),

% Erlang variables are 'single-assignment' i.e. they cannot be reassigned
Map1 = dict:store(circle, 1, Map0),
Map2 = dict:store(triangle, 3, Map1),
Map3 = dict:store(square, 4, Map2),

erlang

Map0 = gb_trees:empty(),

Map1 = gb_trees:enter(circle, 1, Map0),
Map2 = gb_trees:enter(triangle, 3, Map1),
Map3 = gb_trees:enter(square, 4, Map2),

erlang

Map = gb_trees:from_orddict(lists:keysort(1, [{circle, 1}, {triangle, 3}, {square, 4}])),

erlang

Map = ets:new(the_map_name, [ordered_set, private, {keypos, 1}]),
ets:insert(Map, [{circle, 1}, {triangle, 3}, {square, 4}]),

clojure

(def m '{circle 1 triangle 1 square 4})

fsharp

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

fsharp

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

fsharp

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

fsharp

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

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