Run results for: Array.concat vs Array.prototype.concat.apply

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Array.concat

1.6M/s

Array.prototype.concat.apply short form

1.6M/s

Array.prototype.concat.apply

1.4M/s

Array.prototype.concat.apply short form without new empty array at all

1.2M/s

Array.prototype.concat.apply short form without new empty array instance in apply

1.2M/s

View exact numbers

Test name	Executions per second
✓ Array.concat	1,637,340 Ops/sec
Array.prototype.concat.apply short form	1,560,826 Ops/sec
Array.prototype.concat.apply	1,407,759 Ops/sec
Array.prototype.concat.apply short form without new empty array at all	1,205,535 Ops/sec
Array.prototype.concat.apply short form without new empty array instance in apply	1,203,360 Ops/sec

Script Preparation code:

var array1 = Array(400).fill().map(() => Math.round(Math.random() * 40));
var array2 = Array(400).fill().map(() => Math.round(Math.random() * 40));
var array3 = Array(400).fill().map(() => Math.round(Math.random() * 40));
var array4 = Array(400).fill().map(() => Math.round(Math.random() * 40));
var array5 = Array(400).fill().map(() => Math.round(Math.random() * 40));

Tests:

Array.concat
var others = array1.concat(array2, array3, array4, array5);
Array.prototype.concat.apply
var others = Array.prototype.concat.apply([], [array1, array2, array3, array4, array5]);
Array.prototype.concat.apply short form
var others = [].concat.apply([], [array1, array2, array3, array4, array5]);
Array.prototype.concat.apply short form without new empty array instance in apply
var others = [].concat.apply(array1, [array2, array3, array4, array5]);
Array.prototype.concat.apply short form without new empty array at all
var others = array1.concat.apply(array1, [array2, array3, array4, array5]);