StackOverflow2013

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plurals

PO
primarykey
Id
15744085
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-04-01T13:08:22.840
FavoriteCount
0
LastActivityDate
2013-04-01T13:34:13.173
LastEditDate
2013-04-01T13:34:13.173
LastEditorUserId
710446
OwnerUserId
710446
ParentId
15743932
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
There's a difference between a primitive <a href="http://www.ecma-international.org/ecma-262/5.1/#sec-4.3.16" rel="nofollow">string value</a> and a <a href="http://www.ecma-international.org/ecma-262/5.1/#sec-4.3.15" rel="nofollow"><code>String</code> object</a>. <pre><code>'foo' // primitive new String('foo') // object </code></pre> When you call a String member function on a string primitive, it gets wrapped in a String object, which becomes the value of <code>this</code> within the function. (More on this behavior below.) So, in <code>removeExtension</code>, <code>this</code> is a <code>String</code> object. On the other hand, the built-in function <code>this.substr</code> returns a primitive; that's just how it's defined. Thus, you see different things when you return <code>this</code> (<code>String</code> object) versus the result of <code>this.substr</code> (string primitive). If you want to return a string primitive version of the <code>this</code> object, just use <code>this.toString</code>. You see the same wrapping behavior with any primitive, e.g., <code>Number</code>s: <pre><code>Number.prototype.returnThis = function() { return this; } typeof 2; // 'number' typeof (2).returnThis() // 'object' (a Number object, specifically) </code></pre> If you really want to know why this happens, it's in the ECMAScript spec: <blockquote> 10.4.3 Entering Function Code The following steps are performed when control enters the execution context for function code contained in function object F, a caller provided thisArg, and a caller provided argumentsList: <ol> <li>If the function code is strict code, set the <code>ThisBinding</code> to <code>thisArg</code>.</li> <li>Else if thisArg is null or undefined, set the <code>ThisBinding</code> to the global object.</li> <li>Else if <code>Type(thisArg)</code> is not Object, set the <code>ThisBinding</code> to <code>ToObject(thisArg)</code>.</li> <li>....</li> </ol> </blockquote> Point #3 is the important on there: calling functions on primitive values (i.e., non-object) coerces them into their corresponding object form.
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1. POString.prototype.myFunction not returning a string?
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