Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
Chrome 131
Mac OS X 10.15.7
Desktop
27 days ago
Test name Executions per second
Array.prototype.concat 9054719.0 Ops/sec
spread operator 13300706.0 Ops/sec
Script Preparation code:
AخA
 
var array = new Array(10).fill(1)
var toConcat = new Array(10).fill(2)
Tests:
  • Array.prototype.concat

     
    var other = array.concat(toConcat);
  • spread operator

     
    var other = [ ...array, ...toConcat ]