gistfile1.coffee

class Cell extends Backbone.Model
  initialize: ->
    @__defineGetter__ 'selected', -> @get 'selected'
    @__defineSetter__ 'selected', (value)-> @set selected:value


class Sheet extends Backbone.Collection
  initialize: ->
    @__defineGetter__ 'size', -> Math.sqrt @length

  model: Cell

  every_nth: (n, offset=0, smallest=0, largest=@length) ->
    @select (cell) =>
      (@indexOf cell) % n == offset && (@indexOf cell) >=smallest && (@indexOf cell) <= largest

  check_match: (cells) ->
    _.pluck(cells, 'selected').reduce (p,c) -> p && c

  row_matches: ->
    results = for row in [0...@size]
      start = row*@size
      @check_match @models.slice(start, start + @size)
    _.reduce results, (p,c) -> p || c

  column_matches: ->
    results = for row in [0...@size]
      @check_match @every_nth @size, row
    _.reduce results, (p,c) -> p || c

  diagonal_matches: ->
    results = [
      @check_match @every_nth @size+1
      @check_match @every_nth @size-1, 0, @size-1, @length-@size
    ]
    _.reduce results, (p,c) -> p || c



window.sheet = new Sheet

sheet.refresh [
  { value: 'foo', selected: true }
  { value: 'bar', selected: true }
  { value: 'baz', selected: true }
  { value: 'bla', selected: true }
  { value: 'foo', selected: true }
  { value: 'foo', selected: true }
  { value: 'foo', selected: true }
  { value: 'bar', selected: true }
  { value: 'baz', selected: true }
  { value: 'bla', selected: true }
  { value: 'bar', selected: true }
  { value: 'baz', selected: false }
  { value: 'bla', selected: false }
  { value: 'bar', selected: true }
  { value: 'baz', selected: false }
  { value: 'bla', selected: false }
]

Thanks, I'll try this tomorrow. No, this is some Backbone-related stuff: you write an initialize function that gets added to the constructor function that Backbone will create for you, otherwise they will cancel each other out

code continues here: https://github.com/gazs/bingoprototype