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copied!<p><strong><a href="http://jsfiddle.net/alexflav23/y7Xbb/2/" rel="nofollow">Working fiddle</a></strong></p> <p>The reason is because you are using <code>public</code> members for the <code>Person.prototype</code>. You don't need to add <code>this</code> references to these two. So delete:</p> <pre><code>this.id = _id; this.name = _nm; </code></pre> <p>and simply use:</p> <pre><code> var id = _id, name = _nm; </code></pre> <p>Now everything will work fine. The whole idea is to use <code>var</code>, and not <code>this</code>, otherwise a closure will not be created. Now you will not be able to access <code>name</code> and <code>id</code> directly, instead you will have to use <code>setName(), getName(), setId(), getId()</code> etc.</p> <p>The two members, <code>id</code> and <code>name</code>, will now become closures as you want them to be.</p> <p><strong>Update</strong></p> <p>If you used <code>this.id</code>, then it wouldn't have been <code>private</code> and you could just do <code>var p = new Person(1, "Mahesha");</code> and access <code>p.name</code> or <code>p.id</code> directly. They are supposed to be <code>private</code> so this is not what you want.</p> <p>With the closure pattern, p.name and p.id are undefined and can only be accessed through <code>p.getName();</code> and <code>p.getId();</code>. Read on how closures work. The idea is that because you are using that <code>var name</code>, a closure will be created to remember it's value.</p> <p>Your <code>getName</code> and <code>setName</code> are using that closure to access the <code>name</code> property. There is no <code>this.name</code>, there is a value remembered through a higher - order closure.</p>

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