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    <p>Some time ago, I looked at several object systems for JS and even implemented a few of my own, eg <a href="https://bitbucket.org/cggaertner/js-hacks/src/master/class.js" rel="nofollow noreferrer">class.js</a> (<a href="https://bitbucket.org/cggaertner/js-hacks/src/master/class5.js" rel="nofollow noreferrer">ES5 version</a>) and <a href="https://bitbucket.org/cggaertner/js-hacks/src/master/proto.js" rel="nofollow noreferrer">proto.js</a>.</p> <p>The reason why I never used them: you'll end up writing the same amount of code. Case in point: Resig's Ninja-example (only added some whitespace):</p> <pre><code>var Person = Class.extend({ init: function(isDancing) { this.dancing = isDancing; }, dance: function() { return this.dancing; } }); var Ninja = Person.extend({ init: function() { this._super(false); }, swingSword: function() { return true; } }); </code></pre> <p>19 lines, 264 bytes.</p> <p>Standard JS with <code>Object.create()</code> (which is an ECMAScript 5 function, but for our purposes can be replaced by a custom ES3 <a href="https://bitbucket.org/cggaertner/js-hacks/src/master/clone.js" rel="nofollow noreferrer"><code>clone()</code></a> implementation):</p> <pre><code>function Person(isDancing) { this.dancing = isDancing; } Person.prototype.dance = function() { return this.dancing; }; function Ninja() { Person.call(this, false); } Ninja.prototype = Object.create(Person.prototype); Ninja.prototype.swingSword = function() { return true; }; </code></pre> <p>17 lines, 282 bytes. Imo, the extra bytes are not really woth the added complexity of a seperate object system. It's easy enough to make the standard example shorter by adding some custom functions, but again: it's not realy worth it.</p>
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    1. POImproving Simple JavaScript Inheritance
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    1. CO+1, very interesting point of view
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    2. COI used to think the same as you, but now I have to disagree. Basically, all John Resig and I have done is to create a single method ("extend") which wires up the exact object/prototype behavior that you have in your above example (i.e. it's not a new object system). The only difference is the syntax is shorter, tighter, and less error prone when using the extend method.
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    3. COAfter reflecting on it, I agree that using the standard wire-up syntax is just as short as using the extend syntax. I do still think the latter is much cleaner, less error prone, and is more of a "convention over configuration" approach, if that makes sense.
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