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

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko

Browser: IE 11

Operating system: Windows 7

Device Platform: Other

Date tested: 8 years ago

Test name	Executions per second
Array constructor - 100000 items	872285.1 Ops/sec
Array literal - 100000 items	946030.2 Ops/sec
Array literal (assign by index) - 100000 items	971685.2 Ops/sec
Array literal (explicit length) - 100000 items	915577.5 Ops/sec

Script Preparation code:

var n = 10;

function Person(name, age) {
  this.name = name;
  this.age = age;
}

Tests:

Array constructor - 100000 items
var arr = new Array(n); for (var i = 0; i < n; i++) { arr[i] = new Person(i + '', i); }
Array literal - 100000 items
var arr = []; for (var i = 0; i < n; i++) { arr.push(new Person(i + '', i)); }
Array literal (assign by index) - 100000 items
var arr = []; for (var i = 0; i < n; i++) { arr[i] = new Person(i + '', i); }
Array literal (explicit length) - 100000 items
var arr = []; arr.length = n; for (var i = 0; i < n; i++) { arr[i] = new Person(i + '', i); }