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

Anonymous function:

(function(n) { while(n-- && this.push(0)); return this; }).call([], 5);
// => [0, 0, 0, 0, 0]

A bit shorter with for-loop:

(function(n) { for(;n--;this.push(0)); return this; }).call([], 5);
// => [0, 0, 0, 0, 0]

Works with any Object, just change what's inside this.push().

You can even save the function:

function fill(size, content) {
  for(;size--;this.push(content));
  return this;
}

Call it using:

var helloArray = fill.call([], 5, 'hello');
// => ['hello', 'hello', 'hello', 'hello', 'hello']

Adding elements to an already existing array:

var helloWorldArray = fill.call(helloArray, 5, 'world');
// => ['hello', 'hello', 'hello', 'hello', 'hello', 'world', 'world', 'world', 'world', 'world']

Performance: http://jsperf.com/zero-filled-array-creation/25