Compare two arrays in CoffeeScript

arrCompare.coffee

# src: http://stackoverflow.com/a/14853974/613588
# attach the .compare method to Array's prototype to call it on any array
Array.prototype.compare = (array) ->
  # if the other array is a falsy value, return
  return false unless array

  # compare lengths - can save a lot of time
  return false if @length isnt array.length

  for i in [0..@length]
    # Check if we have nested arrays
    if @[i] instanceof Array and array[i] instanceof Array
      # recurse into the nested arrays
      return false unless @[i].compare array[i]
    else if @[i] isnt array[i]
      # Warning - two different object instances will never be equal:
      # {x:20} != {x:20}
      return false