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Simple JavaScript Inheritance with bound callbacks

All credit for the inheritance system goes to John Resig. I adapted it to work both with Node.js or in a browser, and added a function to generate bound callbacks.

// define a class 
var Person = Class.extend({
  // this is the constructor 
  init : function(name) { = name;
  // you can use instance properties in your methods 
  hello : function() {
    console.log("Hello, I'm " + + "!");
// define a subclass 
var Pirate = Person.extend({
  // you can override methods 
  hello : function() {
    console.log("Ahoy! Me be " + + ".");
new Person('Jim').hello();    // #=> "Hello, I'm Jim!" 
new Pirate('John').hello();   // #=> "Ahoy! Me be John." 
// create a bound callback 
var jane = new Person('Jane');
var callback = jane.callback('hello');
// you can use this callback anywhere, it will always be bound to the instance 
callback();   // #=> "Hello, I'm Jane!" 

Clah is tested with Jasmine and Travis CI.

  • master Build Status
  • develop Build Status


With NPM:

npm install clah

In a browser:

<script type='text/javascript' src='/path/to/your/assets/clah.min.js'></script>

Download: Production (minified), Development (uncompressed).

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