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    <p>First of all, <code>var o = {};</code> and <code>var o = new Array();</code> aren't the same. The first initializes an object, the second an array. <code>var o = {};</code> and <code>var o = new Object();</code> are equivalent.</p> <p>Now about the performance of using an object literal instead of adding the properties after. Which one is fastest? The answer is, we don't care, and you shouldn't either. <em>If</em> there is a difference in performance, it will be so small that it will never impact, even if you create 1 million objects at once, which is unlikely to ever happen.</p> <p>This is called premature-optimization, and is the bane of many intermediate programmers. Don't worry about optimizing anything unless you start having performance problems. Then you use a profiler to detect where the bottleneck is and solve it. Just worry about making your app.</p> <p>For completeness' sake, <a href="http://jsperf.com/object-litterals-vs-properties">here is a test I ran on jsperf</a>. In my browser, Chrome 15, the object literal initialization was 53% faster. Wow, 53%, that's huge right? Except if you put your mouse over the tooltip for the test that uses properties after initialization, you'll see it says something like</p> <blockquote> <p>Ran 681,285 times in 0.077 seconds.</p> </blockquote> <p>Your numbers may differ, but you'll be able to observe that the method considered slowest still goes pretty fast by any standards. I think it's safe to say that both are fast enough for any purpose. Just use the one you prefer.</p>
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    1. POIn JavaScript, which method of creating an object with properties is most efficient?
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    1. COSorry, that was a mistype. I meant `new Object();`. I should have done another read-through on my question. Thanks for your input. I don't want to get myself concerned with performance to the point that it negatively affects my development process, but I thought it would be helpful to develop habits for efficient alternatives for common routines.
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    2. CO@Aejay It really really doesn't matter in the end though. I'd just suggest you use the style you prefer or choose one for other reasons than speed, like clarity. Me, for all of the above, I prefer the literal notation. And as a plus, it's the fastest one :)
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