Run results for: Array.prototype.concat vs spread operator on large array

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:137.0) Gecko/20100101 Firefox/137.0

Browser: Firefox 137

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 25 days ago

Test name	Executions per second
Array.prototype.concat	147925.8 Ops/sec
spread operator	17280.6 Ops/sec

Script Preparation code:

var array = new Array(10000).fill(1)
var toConcat = new Array(5000).fill(2)

AخA
 
var array = new Array(10000).fill(1)var toConcat = new Array(5000).fill(2)

Tests:

Array.prototype.concat
var other = array.concat(toConcat);
var other = array.concat(toConcat);
spread operator
var other = [ ...array, ...toConcat ]
var other = [ ...array, ...toConcat ]