StackOverflow2013

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PO
primarykey
Id
16507710
data
AcceptedAnswerId
0
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0
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0
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2013-05-12T13:09:57.527
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0
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2013-05-13T10:04:15.280
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2013-05-13T10:04:15.280
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2355087
OwnerUserId
2355087
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16506829
PostTypeId
2
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0
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0
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text
Body
Let me try to explain using the following: <pre><code>// Scope 1 var Person = function (_id,_nm) { // Scope 2 var id, name; this.id = _id; this.name = _nm; return { // Scope 3 setName: function (nm) { name = nm; }, getName: function () { return name; }, getId: function () { return id; }, print: function () { $("#output").append("Id: "+id+"; Name: "+name + ""); } } } </code></pre> The <code>print</code> method will return <code>undefined</code> because you are referring to the <code>var id, name;</code> that is never set in your code. You set the <code>_id</code> and <code>_name</code> to the property <code>id</code> and <code>name</code> but you fail to return the object that you just created. Instead, you return a dictionary, that references the <code>name</code> and <code>id</code> variable you created in <code>Scope 2</code> that you never set, hence the undefined output in the <code>print()</code> call. Here is what you should have done: <pre><code>var NewPerson = function (_id,_nm) { var self = this; this.id = _id; this.name = _nm; this.print = function () { $("#output").append("New Person Id: "+this.id+"; Name: "+ this.name + ""); }; return this; }; var nperson = new NewPerson(456, "Marcos"); nperson.print(); </code></pre> This will output: <pre><code>New Person Id: 456; Name: Marcos </code></pre> In essence, <code>new</code> is creating a new object represented by <code>this</code>, and you must return <code>this</code> to have a reference to the object created. In fact, if you do not use the <code>new</code> before creating an object, you end up referencing a global instance of <code>this</code>. Try the following: <pre><code>var nperson = new NewPerson(456, "Marcos"); this.name = "Hello"; nperson.print(); var nperson1 = NewPerson(456, "Marcos"); this.name = "Hello"; nperson1.print(); </code></pre> You will see that the first output will be as expected: <pre><code>New Person Id: 456; Name: Marcos </code></pre> But the second will pick up the change made to <code>this.name</code>: <pre><code>New Person Id: 456; Name: Hello </code></pre> <a href="http://jsfiddle.net/marcoslin/5vp2R/2/" rel="nofollow">Here is the JSFiddle</a>.
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1. POWhy these closure based private variables in JavaScript not working
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1. USmarcoseu
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1. USmarcoseu
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