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4623578
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2011-01-07T07:55:56.830
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2011-01-07T07:55:56.830
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4622952
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text
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Well I can't follow the part with the <code>length</code> being <code>0</code>, did you actually run the loop? It should work just fine. But concerning the <code>typeof</code> operator, that operator (together with instanceof operator) is probably the biggest design flaw of JavaScript. It is near of being completely broken. Although <code>instanceof</code> still has its limited uses, <code>typeof</code> really has only one practical use case, which not happens to be checking the type of an object. The JavaScript Typetable <pre><code>Value Class Type ------------------------------------- "foo" String string new String("foo") String object 1.2 Number number new Number(1.2) Number object true Boolean boolean new Boolean(true) Boolean object new Date() Date object new Error() Error object [1,2,3] Array object new Array(1, 2, 3) Array object new Function("") Function function /abc/g RegExp object (function in Nitro/V8) new RegExp("meow") RegExp object (function in Nitro/V8) {} Object object new Object() Object object </code></pre> In the above table Type refers to the value the <code>typeof</code> operator returns. As you can see this is anything but consistent. The Class refers to the value of the internal <code>[[Class]]</code> property of an object. <blockquote> From the Specification: Class can be one of the following values: <code>"Arguments"</code>, <code>"Array"</code>, <code>"Boolean"</code>, <code>"Date"</code>, <code>"Error"</code>, <code>"Function"</code>, <code>"JSON"</code>, <code>"Math"</code>, <code>"Number"</code>, <code>"Object"</code>, <code>"RegExp"</code>, <code>"String"</code> </blockquote> In order to retrieve the value of Class one can has to make use of the <code>toString</code> method of <code>Object</code>. Checking the Class of an Object <pre><code>function is(type, obj) { return Object.prototype.toString.call(obj).slice(8, -1) === type; } is('String', 'test'); // true is('String', new String('test')); // true </code></pre> In the above code <code>Object.prototype.toString</code> gets called with <code>this</code> being set to the object which its Class value should be retrieved. Checking whether a variable has been defined <pre><code>typeof foo !== 'undefined' </code></pre> The above will check whether <code>foo</code> was actually declared or not, since just referencing it would result in a <code>ReferenceError</code>. This is the only thing <code>typeof</code> is actually useful for. To Sum it up Don't use <code>typeof</code> unless you're checking for the existence of a variable.
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