Most efficient way to create a zero filled JavaScript array?

Question

What is the most efficient way to create an arbitrary length zero filled array in JavaScript?

Answer 1

using object notation

var x = [];

zero filled? like...

var x = [0,0,0,0,0,0];

filled with 'undefined'...

var x = new Array(7);

obj notation with zeros

var x = [];
for (var i = 0; i < 10; i++) x[i] = 0;

As a side note, if you modify Array's prototype, both

var x = new Array();

and

var y = [];

will have those prototype modifications

At any rate, I wouldn't be overly concerned with the efficiency or speed of this operation, there are plenty of other things that you will likely be doing that are far more wasteful and expensive than instanciating an array of arbitrary length containing zeros.