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    <p>I've got at least half a dozen implementations of various inheritance patterns lying around in my <code>dev/web/stuff</code> folder, but they are mostly toys.</p> <p>What I actually sometimes use is the following thin wrapper over JavaScript's default pseudo-class-based approach to make inheritance easier:</p> <pre><code>Function.prototype.derive = (function() { function Dummy() {} return function() { Dummy.prototype = this.prototype; return new Dummy; }; })(); </code></pre> <p>Example code:</p> <pre><code>function Pet(owner, type, name) { this.owner = owner; this.type = type; this.name = name; } Pet.prototype.toString = function() { return this.owner + '\'s ' + this.type + ' ' + this.name; }; function Cat(owner, name) { Pet.call(this, owner, 'cat', name); } Cat.prototype = Pet.derive(); var souris = new Cat('Christoph', 'Souris'); </code></pre> <p>Another interesting one is the following, which automatically adds factory methods to a proper prototypal approach:</p> <pre><code>var Proto = new (function() { function Dummy() {} this.clone = function() { Dummy.prototype = this; return new Dummy; }; this.init = function() {}; this.create = function() { var obj = this.clone(); this.init.apply(obj, arguments); return obj; }; }); </code></pre> <p>Example code:</p> <pre><code>var Pet = Proto.clone(); Pet.init = function(owner, type, name) { this.owner = owner; this.type = type; this.name = name; }; Pet.toString = function() { return this.owner + '\'s ' + this.type + ' ' + this.name; }; Cat = Pet.clone(); Cat.init = function(owner, name) { Pet.init.call(this, owner, 'cat', name); }; // use factory method var filou = Cat.create('Christoph', 'Filou'); // use cloning (the proper prototypal approach) var red = filou.clone(); red.name = 'Red'; </code></pre> <p>You've <a href="https://stackoverflow.com/questions/1404559/what-will-be-a-good-minimalistic-javascript-inheritance-method/1404697#1404697">already seen</a> my <a href="http://mercurial.intuxication.org/hg/js-hacks/raw-file/tip/class.js" rel="nofollow noreferrer">implementation of classes</a>.</p>
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    1. POPopular JavaScript Inheritance Patterns
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    1. COHi Christoph! Thanks. So your derive method is really the same as my inherit method except it returns a closure and calls 'itself'; the pattern also uses constructor stealing - I think it's essentially a combination inheritance pattern (prototypal and constructor stealing combined). I'm going to need to stare at the other pattern a bit longer - I think I'll play with it tonight and report back ;-) Thanks for sharing Christoph.
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