Wraps function that yields (is called with) multiple values with the Enumerable API (js 1.6 Array methods)

enumerable.coffee

class Enumerable
  constructor: (@fn,bind) ->
    if bind
      fn = @fn
      @fn = -> fn.apply(bind,arguments)
  map: (transform) ->
    results = []
    @fn ->
      results.push transform(
        if arguments.length == 1
          arguments[0]
        else
          [].slice.call(arguments,0)
      )
    results
["forEach","reduce","filter","every","some"].forEach (method) ->
  Enumerable::[method] = ->
    mapped = @map (x) -> x
    mapped[method].apply(mapped,arguments)

oddArray = [1,2,3,4,5,5,6]
oddArray.allTheThings = oddArray.forEach
enumer = new Enumerable(oddArray.allTheThings,oddArray)
console.log "map",re =  enumer.map((x) -> x)
console.log "ev", re = enumer.every(([el,i,a]) -> el % 2 == 0), re == false
console.log "sm", re = enumer.some(([el,i,a]) -> el % 2 == 0), re == true
console.log "fi", re = enumer.filter(([el,i,a]) -> el % 2 == 0), re.length == 3
console.log "re", re = enumer.reduce(((s,[el,i,a]) -> s + el),0), re == 26

Number::times = (fn) ->
  n = 0
  fn(n) while(n < this && n += 1)
  null
once = new Enumerable(Number::times,1)
console.log once.map((x) -> 2*x*x)
thrice = new Enumerable(Number::times,3)
console.log thrice.map((x) -> x*x)
console.log thrice.reduce(((s,el) -> s + el),0)