pub sub

non-minified.js

var pubsub = {
  // A map of event names to the listeners attached to it.
  // :: { "String" -> [Function] }
  events: { }

  // Notifies all the listeners of an event
  // :: String, a... -> Undefined
, pub: function(event) {
    var events = this.events[event] || []
    var args   = arguments
    events.forEach(function(listener){ listener.apply(null, args) })
  }

  // Attaches a listener to an event
  // :: String, Function -> Undefined
, sub: function(event, listener) {
    this.events[event] = this.events[event] || []
    this.events[event].push(listener)
  }
}

real-easy.js

var pubsub = {
  evs: {}
, pub: function(e,d){(this.evs[e]||[]).forEach(function(h){h(d)})}
, sub: function(e,h){(this.evs[e]||(this.evs[e]=[])).push(h)}
}