Source: Mediator.js

Original post: Mediators for Modularized Asynchronous Programming in Javascript

As I was reading Addy Osmani's excellent post Patterns For Large-Scale JavaScript Application Architecture, I came to the realization that I had made some past changes to my own Mediator.js library, but had failed to both upload the changes to Github and  use some of the tricks I've picked up since originally writing the library. So, version 0.2 is out, with the following changes:

• API changes
• "Subscribe" in place of "Add"
• "Publish" in place of "Call"
• Subscribe now takes a context object, to allow you to pass in what @this@ should be when the callback is called
• Mediator no longer forces you to use it as a singleton
• No longer looks for "type" as part of a data object; rather, uses channels to sub/pub
• Code a whole lot cleaner; objects to pass around subscriber info rather than numerically-indexed arrays
• Passes arguments you pass into publish onto subscriber callbacks, rather than a data object

• Example:

  var m = new Mediator(); m.Subscribe("test", function(arg1, arg2){ console.log([arg1, arg2]); } m.Publish("test", "arg1", "arg2"); // output > ["arg1", "arg2"]

• Meta changes

• Tests are now "real" tests, using Jasmine
• Updated Readme file to reflect new information
• Added minified js (and under 500 bytes, too)

I think the main difference between this and most available and/or roll-your-own Mediators is the predicate matching, although that may also be what makes this more / different than a traditional Mediator. Mediator+? A meatier mediator? Meatiator.

Anyway,here's an example on jsfiddle. Try chatting, and using the same name for the from/to fields. Shows predicates, subscriptions, and removing subscriptions.