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POWhat is the correct prototype affectation in javascript inheritance?
 

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  1. POWhat is the correct prototype affectation in javascript inheritance?
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    <p>I read several articles on js inheritance already (<a href="http://alexsexton.com/blog/2013/04/understanding-javascript-inheritance">this one</a>, <a href="http://ericleads.com/2013/02/fluent-javascript-three-different-kinds-of-prototypal-oo/">this one</a>, <a href="http://javascript.crockford.com/private.html">this one</a>, etc.)</p> <p>In <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Introduction_to_Object-Oriented_JavaScript#Inheritance">this article</a> from Mozilla, "classic" inheritance is shown as this : (I uniformized examples)</p> <pre><code>// inherit Base function Derived() { ... } Derived.prototype = new Base(); &lt;------- Derived.prototype.constructor = Derived; &lt;------- </code></pre> <p>However in <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create">this article</a> I see :</p> <pre><code>// inherit Base function Derived() { ... } Derived.prototype = Object.create(Base.prototype); &lt;------- Derived.prototype.constructor = Derived; </code></pre> <p>Moreover I have also seen this :</p> <pre><code>Derived.prototype = Base.prototype; </code></pre> <p>And I also experimented and couldn't find the use of <code>constructor</code> affectation :</p> <pre><code>Derived.prototype.constructor = Derived; &lt;--- it still work if I skip this line </code></pre> <p>if I skip this line, <code>new Derived()</code> correctly calls <code>Derived()</code> anyway.</p> <p>So 1) what is correct :</p> <ol> <li><code>Derived.prototype = new Base();</code></li> <li><code>Derived.prototype = Object.create(Base.prototype);</code></li> <li><code>Derived.prototype = Base.prototype;</code></li> <li>other ?</li> </ol> <p>And 2) is <code>Derived.prototype.constructor = Derived;</code> really needed ? Why ?</p>
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    1. COthat's the thing about javascript, you can do what you like.. I like John Resig's class.js way of wrapping the prototype nonsense for you, so that you never have to see it in your code.http://ejohn.org/blog/simple-javascript-inheritance/
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    2. CO`Object.create()` is a relatively recent command which did not exist previously. See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create (the browser compatibility overview is at the bottom of that page). If you use only browsers that have it, use it, otherwise don't - how's that for a ridiculously obvious piece of advice? :)
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