Aspect Oriented Programming for Javascript. It allows you to change the behavior of, or add behavior to methods and functions (including constructors) non-invasively.

As a simple example, instead of changing code, you can use meld to log the result of myObject.doSomething:

var myObject = {
	doSomething: function(a, b) {
		return a + b;
	}
};

// Call a function after myObject.doSomething returns
var remover = meld.after(myObject, 'doSomething', function(result) {
	console.log('myObject.doSomething returned: ' + result);
});

myObject.doSomething(1, 2); // Logs: "myObject.doSomething returned: 3"

remover.remove();

myObject.doSomething(1, 2); // Nothing logged

API docs

1. git clone https://github.com/cujojs/meld or git submodule add https://github.com/cujojs/meld

2. Configure your loader with a package:

   packages: [
   	{ name: 'meld', location: 'path/to/meld', main: 'meld' },
   	// ... other packages ...
   ]

3. define(['meld', ...], function(meld, ...) { ... }); or require(['meld', ...], function(meld, ...) { ... });

1. git clone https://github.com/cujojs/meld or git submodule add https://github.com/cujojs/meld
2. <script src="https://redirect.github.com/path/to/meld/meld.js"></script>
3. meld will be available as window.meld

1. npm install meld
2. var meld = require('meld');

1. ringo-admin install cujojs/meld
2. var meld = require('meld');

Install buster.js

npm install -g buster

Run unit tests in Node:

1. buster test -e node

Run unit tests in Browsers (and Node):

1. buster server - this will print a url
2. Point browsers at /capture, e.g. localhost:1111/capture
3. buster test or buster test -e browser

• Fix for context when advising constructors: this is now the constructed instance in all advice functions.

• Fix for global name when using meld as a browser global. Thanks @scothis
• Update unit tests to run in browser using buster server, in addition to node. Thanks again, @scothis :)

• Advice can be applied directly to functions without a context.
• Advice can be applied to constructors.
• joinpoint.proceed() can be called multiple times. This makes it possible to implement "retry" types of advice.

• aop.js is now meld.js
• Use Travis CI

• Optimizations to run time advice invocation, especially around advice
• Fix for passing new args to joinpoint.proceed() in around advice
• Added joinpoint.proceedApply(array) for proceeding and supplying new arguments as an array
• Ported unit tests to BusterJS

• First official release as part of cujojs
• Minor doc and package.json tweaks

• Revert to larger, more builder-friendly module boilerplate. No functional change.

• Minor corrections and updates to package.json

• Rewritten Advisor that allows entire aspects to be unwoven (removed) easily.

• AspectJ and Spring Framework AOP for inspiration and great docs
• Implementation ideas from @phiggins42's uber.js AOP
• API ideas from jquery-aop