Super simple "pub-sub" code

gistfile1.js

REGISTRY = {}

function sub (name, cb, ctx) {
  if (typeof REGISTRY[name] === "undefined") {
    REGISTRY[name] = [];
  } 
  return REGISTRY[name].push({cb: cb, ctx: ctx || null});
} 

function pub (name) {
  var subscribers = REGISTRY[name] || [];
  for (var i=0; i<subscribers.length; i++) {
    subscribers[i].cb.call(subscribers[i].ctx);
  }
  return subscribers.length;
}



/* Example usage */
sub("hello", function () { console.log("I got hello!"); });
sub("hello", function () { console.log("I also got hello!"); });
sub("bye", function () { console.log("I got bye!"); });

pub("hello");
pub("bye");