Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:95.0) Gecko/20100101 Firefox/95.0
Firefox 95
Windows
Desktop
3 years ago
Test name Executions per second
native map 3761337.2 Ops/sec
costume 3809838.0 Ops/sec
Tests:
  • native map

    AخA
     
    let arr = [1,3,5,7,9,2,4,6,8,0];
    let native = arr.map(item => item*2+3);
  • costume

    x
     
    let arr = [1,3,5,7,9,2,4,6,8,0];
    let i=0, len=arr.length, out=new Array(len);
        for (; i < len; i++) {
            out[i] = arr[i]*2+3;
        }