An example of angular.js controller written in CoffeeScript

dialogs.controller.coffee

###
 Dialogs Controller

 @author Alexei Antipov <antipov.alexei@gmail.com>
###

define [], () ->
  'use strict'

  class DialogsCtrl
    _services = {}
    _itemsDeferred = no
    _limit = 20 # Items per page

    constructor: (args...) ->
      _services = _.object(DialogsCtrl.$inject, args)

      # Init variables, exported to the view
      @items = [] # Dialogs list
      @total = 0 # Total number of dialogs
      @pattern = '' # Search input
      @active = no # Active dialog
      @isLoading = on # The state of dialogs loading

      # Get the first portion of dialogs
      do @_getItems

    # Search dialogs #
    search: ->
      @items.length = 0

      do @closeMessages
      do @_getItems

    # Get next portion of dialogs #
    getItems: ->
      return if @isLoading

      do @_getItems

    # Load dialog messages #
    loadMessages: (dialog) ->
      @active = dialog.id
      dialog = _.find(@items, {id: dialog.id})
      dialog && dialog.new_messages_count = 0 # Mark messages as read.
      _services.$state.go 'index.dialog.id', {id: dialog.id}

    # Close dialog messages list #
    closeMessages: ->
      @active = no
      _services.$state.go 'index.dialog'

    # Private method to get dialogs data #
    _getItems: ->
      _itemsDeferred and _itemsDeferred.reject(no) # Cancel current request if any
      _itemsDeferred = _services.$q.defer() # And create new request
      defer = _itemsDeferred

      @isLoading = on

      _services.dialogsApi.getItems {count: _limit, start: @items.length, pattern: @pattern}
      .then (data) =>
        defer.resolve(data)
      .catch (error) ->
        defer.reject(error)

      defer.promise
      .then (data) =>
        @total = data.total
        @items = @items.concat data.dialogs
        @isLoading = no

        data

  DialogsCtrl.$inject = ['$q', '$state', '$log', 'dialogsApi']

  DialogsCtrl