Cannot enter CoffeeScript for loop

Question

Why isn't my code hitting the line that contains the alert?

window.Game = class Game
  constructor: ->
    rows: 22
    columns: 10
    board: []

createBoard: ->                                                                                                                                                                                           
  # Some code here...
  for x in [0...@columns]
    alert("THIS IS HERE")
  # More code down here...

mu is too short · Accepted Answer · 2013-07-01 02:19:58Z

2

Probably because @columns is undefined.

Your constructor:

constructor: ->
  rows: 22
  columns: 10
  board: []

simply creates an object and throws it away, it is the same as this:

constructor: ->
  o = {
    rows: 22
    columns: 10
    board: []
  }
  return

So no instance variables are set and your constructor doesn't do much at all. Perhaps you meant to say:

constructor: ->
  @rows = 22
  @columns = 10
  @board = []

or possibly:

constructor: (@rows = 22, @columns = 10, @board = [ ]) ->

I'm assuming that your createBoard method is actually indented one level so that it is a method in your Game class.

edited Jul 1, 2013 at 2:19

answered Jul 1, 2013 at 2:00

mu is too short

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