126 lines
2.8 KiB
CoffeeScript
126 lines
2.8 KiB
CoffeeScript
# Arguments
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# ---------
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# shared identity function
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id = (_) -> if arguments.length is 1 then _ else Array::slice.call(arguments)
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test "basic argument passing tests", ->
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a = {}
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b = {}
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c = {}
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eq 1, (id 1)
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eq 2, (id 1, 2)[1]
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eq a, (id a)
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eq c, (id a, b, c)[2]
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test "passing arguments on separate lines", ->
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a = {}
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b = {}
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c = {}
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ok(id(
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a
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b
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c
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)[1] is b)
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eq(0, id(
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0
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10
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)[0])
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eq(a,id(
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a
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))
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eq b,
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(id b)
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test "reference `arguments` inside of functions", ->
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sumOfArgs = ->
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sum = (a,b)-> a + b
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Array::reduce.call(arguments,sum,0)
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eq 10, sumOfArgs(0, 1, 2, 3, 4)
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#### Parameter List Features
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test "splats", ->
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arrayEq [0, 1, 2], (((splat...) -> splat) 0, 1, 2)
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arrayEq [2, 3], (((_, _, splat...) -> splat) 0, 1, 2, 3)
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arrayEq [0, 1], (((splat..., _, _) -> splat) 0, 1, 2, 3)
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arrayEq [2], (((_, _, splat..., _) -> splat) 0, 1, 2, 3)
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test "@-parameters: automatically assign an argument's value to a property of the context", ->
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nonce = {}
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((@prop) ->).call context = {}, nonce
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eq nonce, context.prop
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# allow splats along side the special argument
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((splat..., @prop) ->).apply context = {}, [0, 0, nonce]
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eq nonce, context.prop
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# allow the argument itself to be a splat
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((@prop...) ->).call context = {}, 0, nonce, 0
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eq nonce, context.prop[1]
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# the argument should still be able to be referenced normally
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eq nonce, (((@prop) -> prop).call {}, nonce)
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test "@-parameters and splats with constructors", ->
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a = {}
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b = {}
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class Klass
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constructor: (@first, splat..., @last) ->
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obj = new Klass a, 0, 0, b
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eq a, obj.first
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eq b, obj.last
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test "destructuring in function definition", ->
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(([{a: [b], c}]...) ->
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eq 1, b
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eq 2, c
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) {a: [1], c: 2}
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test "default values", ->
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nonceA = {}
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nonceB = {}
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a = (_,_,arg=nonceA) -> arg
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eq nonceA, a()
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eq nonceA, a(0)
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eq nonceB, a(0,0,nonceB)
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eq nonceA, a(0,0,undefined)
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eq nonceA, a(0,0,null)
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eq false , a(0,0,false)
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eq nonceB, a(undefined,undefined,nonceB,undefined)
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b = (_,arg=nonceA,_,_) -> arg
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eq nonceA, b()
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eq nonceA, b(0)
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eq nonceB, b(0,nonceB)
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eq nonceA, b(0,undefined)
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eq nonceA, b(0,null)
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eq false , b(0,false)
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eq nonceB, b(undefined,nonceB,undefined)
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c = (arg=nonceA,_,_) -> arg
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eq nonceA, c()
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eq 0, c(0)
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eq nonceB, c(nonceB)
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eq nonceA, c(undefined)
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eq nonceA, c(null)
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eq false , c(false)
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eq nonceB, c(nonceB,undefined,undefined)
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test "default values with @-parameters", ->
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a = {}
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b = {}
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obj = f: (q = a, @p = b) -> q
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eq a, obj.f()
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eq b, obj.p
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test "default values with splatted arguments", ->
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withSplats = (a = 2, b..., c = 3, d = 5) -> a * (b.length + 1) * c * d
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eq 30, withSplats()
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eq 15, withSplats(1)
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eq 5, withSplats(1,1)
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eq 1, withSplats(1,1,1)
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eq 2, withSplats(1,1,1,1)
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