19 lines
352 B
CoffeeScript
19 lines
352 B
CoffeeScript
class ShimSet
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constructor: ->
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@elements = {}
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@size = 0
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has: (value) ->
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value of @elements
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add: (value) ->
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return if @elements[value]
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@elements[value] = true
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@size++
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delete: (value) ->
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return unless @elements[value]
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delete @elements[value]
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@size--
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window.Set = ShimSet unless 'Set' of window
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return ShimSet
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