const ion = import '../'
import './Map'

const SetShim(items) ->
    if items?
        throw new Error("Don't add items in the constructor, IE implementation of Set breaks this")
    let map = new Map
    const methods =
        has: (key) -> map.has(key)
        delete: (key) -> map.delete(key)
        add: (key) -> map.set(key, true)
        forEach: (callback, thisArg) ->
            map.forEach(
                (value, key) =>
                    callback.call(thisArg, key, @)
            )
    for key, value of methods
        Object.defineProperty(@, key, {value})

# we will even replace Googles crap implementation of Map that doesn't yet have forEach or keys
if not global.Set? or not Set.prototype.forEach?
    if global.window
        console.warn('Shimming Set')
    global.Set = SetShim

export const test = ->
    const Set = global.Set
    let a = {}
    let b = ->
    let set = new Set()
    set.add(a)
    set.add(b)
    assert set.has(a)
    assert set.has(b)
    set.delete(b)
    assert not set.has(b)
    set.add(b)
    assert set.has(b)