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

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 14268.67.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.111 Safari/537.36

Browser: Chrome 96

Operating system: Chrome OS 14268.67.0

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Array constructor - 100000 items	161.0 Ops/sec
Array literal - 100000 items	198.9 Ops/sec
Array literal (assign by index) - 100000 items	223.3 Ops/sec
Array literal (explicit length) - 100000 items	234.2 Ops/sec

Script Preparation code:

var n = 10000;

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); }