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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser: Firefox 133

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Array constructor - 100000 items

3K/s

Array literal (explicit length) - 100000 items

3K/s

Array literal - 100000 items

3K/s

Array literal (assign by index) - 100000 items

3K/s

View exact numbers

Test name	Executions per second
✓ Array constructor - 100000 items	2,995 Ops/sec
Array literal (explicit length) - 100000 items	2,857 Ops/sec
Array literal - 100000 items	2,797 Ops/sec
Array literal (assign by index) - 100000 items	2,794 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); }