Polyfill Set

Author: sstephenson

polyfills/polyfills.coffee

@@ -1,2 +1,3 @@
+#= require ./set
 #= require ./vendor/promise
 #= require ./vendor/custom-elements

polyfills/set.coffee

@@ -0,0 +1,24 @@
+window.Set ?= class Set
+  constructor: ->
+    @clear()
+
+  clear: ->
+    @values = []
+
+  has: (value) ->
+    @values.indexOf(value) isnt -1
+
+  add: (value) ->
+    unless @has(value)
+      @values.push(value)
+    this
+
+  delete: (value) ->
+    if (index = @values.indexOf(value)) is -1
+      false
+    else
+      @values.splice(index, 1)
+      true
+
+  forEach: ->
+    @values.forEach(arguments...)