Run results for: Array concat vs spread operator vs push vs array length + assign

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser: Chrome 128

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

spread operator

8.0M/s

Push

7.4M/s

Array.prototype.concat

4.3M/s

length + assign

1.1M/s

View exact numbers

Script Preparation code:

var orig = [ "hello", true, 7 ];

Tests:

Array.prototype.concat
var other = [ 1, 2 ].concat(orig);
spread operator
var other = [ 1, 2, ...orig ]
Push
var other = [ 1, 2 ].push(...orig);
length + assign
var other = [ 1, 2 ]; other.length = other.length + orig.length for(var i = 0; i < orig.length; i++) { other[other.length + i] = orig[i] }