Run results for: Array constructor vs literal performance - 100000 items

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2906.0 Safari/537.36

Browser: Chrome 56

Operating system: Windows 7

Device Platform: Other

Date tested: 8 years ago

Test name	Executions per second
Array constructor - 100000 items	1079.6 Ops/sec
Array literal - 100000 items	633.6 Ops/sec
Array literal (assign by index) - 100000 items	637.7 Ops/sec
Array literal (explicit length) - 100000 items	1450.6 Ops/sec
Array constructor (no new) - 100000 items	1301.0 Ops/sec

Tests:

Array constructor - 100000 items
var n = 100000; var arr = new Array(n); for (var i = 0; i < n; i++) { arr[i] = i; }
Array literal - 100000 items
var n = 100000; var arr = []; for (var i = 0; i < n; i++) { arr.push(i); }
Array literal (assign by index) - 100000 items
var n = 100000; var arr = []; for (var i = 0; i < n; i++) { arr[i] = i; }
Array literal (explicit length) - 100000 items
var n = 100000; var arr = []; arr.length = n; for (var i = 0; i < n; i++) { arr[i] = i; }
Array constructor (no new) - 100000 items
var n = 100000; var arr = Array(n); for (var i = 0; i < n; i++) { arr[i] = i; }