MeasureThat.net

Run results for: Array loop vs foreach vs map vs while new array

Go to the benchmark
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
foreach 48.8 Ops/sec
for 63.3 Ops/sec
map 57.9 Ops/sec
while 63.5 Ops/sec
Script Preparation code:
AخA
 
   var arr = [];
    for (var i = 0; i < 1000000; i++) {
      arr[i] = i;
    }
  
    function someFn(i) {
      return i * 3 * 8;
    }
Tests:

  • foreach

    ​x
     
    var newArr = []
    ​
    arr.forEach(function (item){
      newArr.push(someFn(item));
    })

  • for

     
    var newArr = []
    ​
    for (var i = 0, len = arr.length; i < len; i++) {
      newArr.push(someFn(arr[i]));
    }

  • map

     
    var newArr = arr.map(item => someFn(item))

  • while

     
    let i = 0, len = arr.length;
    var newArr = []
    while (i<len) {
      newArr.push(someFn(arr[i]));
      i++;
    }