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Array Duplication Made Easy
       by ilyas usal

To make a duplicate of an array proves more difficult than it seems. For instance, if you try this piece of code:

It will return:


Even though you've applied the method Array.pop on a only. b is a reference to a, an alias if you prefer, not a copy, and modifying a will modify b.

So here's the little trick that solves the problem. All you have to do is use the Array.splice method (Array.concat or Array.join will work too), with no parameter to keep the whole array.

Hope this helps. Thanks to senocular and jbradley who helped contribute to this.



Hope this tutorial helped. If you have any questions, please post them on the forums at //www.kirupa.com/forum/


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