Deferred Resizer in CoffeeScript

resizer.coffee

# Delayed resize task runner

class DeferredResizer
  constructor: ->
    @timer = null
    @tasks = []
  addTask: (task) ->
    @tasks.push(task) if @tasks.indexOf(task) is -1
  doTasks: =>
    @timer = null
    task false for task in @tasks
  schedule: ->
    if @timer
      clearTimeout @timer
    else
      starting = true
    @timer = setTimeout @doTasks, 100
    if starting
      task true for task in @tasks

# example usage

  resizer = new DeferredResizer()

  resizer.addTask (starting) ->
    $('.marker').each (i, el) ->
      marker = $(@).data('marker')
      if starting
        marker.hide()
      else
        marker.update()
        marker.show()

  $(window).resize (evt) ->
    resizer.schedule()