Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36
Chrome 85
Windows
Desktop
4 years ago
Test name Executions per second
Array.prototype.concat 2995701.8 Ops/sec
Array.prototype.push 8113733.0 Ops/sec
Array.prototype.splice 0.4 Ops/sec
Script Preparation code:
AخA
 
var arr = [1, 2, 3];
Tests:
  • Array.prototype.concat

     
    var other = arr.concat([99]);
  • Array.prototype.push

     
    var other = arr.push(99);
  • Array.prototype.splice

     
    var other = arr.splice(arr.length-1, 0, 99);
  • spread operator

     
    var other = [ ...arr, 99 ]