A custom include function to shortcut around the rather robust verbiage required for the "some" method.

include.coffee

# include
# depends on some, a shim for which can be found at https://gist.github.com/l3ck/6418548
if "function" isnt typeof Array::include
  Array::include = (sought_value) ->
    "use strict"

    # throw on null
    throw new TypeError("Array.prototype.include called on null or undefined")  if null is this or "undefined" is typeof this

    @some (element, index, array) ->
      element is sought_value