https://github.com/odesskij/brander-edu-js#3-Событийная-система

brander-edu3.coffee

class Events
  constructor: () ->
    @events = {}
  trigger: (event, args...) ->
    if @events[event]?
      e = @events[event]
      for h in e.handlers
        h.callback.apply h.context, args
      return;
  on: (event, callback, context) ->
    e = if @events[event]? then @events[event] else @events[event] = {handlers: []}
    e.handlers.push {callback, context}

###
Tests
###
object = new Events

object.on 'event', (args...) ->
  s = 0
  for i in args
    s += i
  console.log s

object.trigger 'event', 1, 2, 3, 4

for i in [0..3]
  do (i) -> object.on 'eventTwo', () ->
    console.log "event #{i}"

object.trigger 'eventTwo'

object.on 'eventThree', (() -> console.log "random #{do @random}"), Math

object.trigger 'eventThree'

brander-edu3.js

var object = {
        "_events": {},
        "trigger": function (event) {
            if (!this._events.hasOwnProperty(event)) {
                return;
            }

            var e = this._events[event];

            var args = [];
            for (var i = 1; i < arguments.length; i++) {
                args.push(arguments[i]);
            }
            for (var entry in e.callbacks) {
                if (e.callbacks.hasOwnProperty(entry)) {
                    var c = e.callbacks[entry];
                    c.f.apply(c.c, args);
                }
            }
        },
        "on": function (event, callback, context) {
            var e = this._events.hasOwnProperty(event) ?
                this._events[event] :
                this._events[event] = {"callbacks": []};

            e.callbacks.push({
                "f": callback,
                "c": context
            });
        }
    };


    object.on('event', function () {
        var s = 0;
        for (var i = 0; i < arguments.length; i++) {
            s += arguments[i];
        }

        console.log(s);
    });

    object.trigger('event', 1, 2, 3, 4); // => 10

    for (var i = 0; i < 3; i++) {
        (function (index) {
            object.on('eventTwo', function () {
                console.log('event => ' + index);
            });
        })(i);
    }

    object.trigger('eventTwo');

    object.on('eventThree', function () {
        console.log('random ' + this.random());
    }, Math);

    object.trigger('eventThree');