Run results for: Array initialization

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:50.0) Gecko/20100101 Firefox/50.0

Browser: Firefox 50

Operating system: Mac OS X 10.12

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
Decide length in `new`	2.1 Ops/sec
Decide length with assignment	2.1 Ops/sec
Push items separately	111.5 Ops/sec

Script Preparation code:

var len = 100;

Tests:

Decide length in `new`
var a = new Array(len), i; for (i = 0; i < len; i++) { a[i] = i; } window.a = a;
Decide length with .length
var a = [], i; a.length = len; for (i = 0; i < len; i++) { a[i] = i; } window.a = a;
Push items separately
var a = [], i; for (i = 0; i < len; i++) { a.push(i); } window.a = a;
Assign items separately
var a = [], i; for (i = 0; i < len; i++) { a[i] = i; } window.a = a;