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I often define an array like this:

var arr = new Array();

But when my PM saw my code, my PM said that I should define an array like this:

var arr = [];

and it will be more efficient. I find that there is another defined way var arr = ();?

What is the difference between them and which way do you often use?

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    What is var arr = (); ? Commented Aug 17, 2014 at 4:33
  • 1
    Best parctice is to use var arr = []; instead of var arr = new Array(); because Array object can be overwritten in JavaScript, but the array literal can't Commented Aug 17, 2014 at 4:35
  • @SubodhGhulaxe, Array object can be overwritten to what?Can you give me an example? Commented Aug 17, 2014 at 4:37
  • 1
    this question is already here stackoverflow.com/questions/2280285/… Commented Aug 17, 2014 at 4:53
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