MeasureThat.net

Run results for: Array loop vs for loop vs for loop cached

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Run details:
Mozilla/5.0 (Android 13; Mobile; rv:122.0) Gecko/122.0 Firefox/122.0
Firefox Mobile 122
Android
Mobile
one year ago
Test name Executions per second
foreach 54208.8 Ops/sec
map 26685.7 Ops/sec
for each 79064.2 Ops/sec
for each cached 77794.3 Ops/sec
for each cached reversed 92935.9 Ops/sec
Script Preparation code:
AخA
 
function getArr() {
    return Array(1000).fill(1);
//  var arr = [];
//    for (var i = 0; i < 1000; i++) {
//      arr[i] = i;
//    }
//    return arr;
}
  
function someFn(i) {
  return i * 3 * 8;
}
Tests:

  • foreach

     
    var arr = getArr();
    arr.forEach((item) => {
      someFn(item);
    })

  • map

     
    var arr = getArr();
    arr.map(item => someFn(item));

  • for each

     
    var arr = getArr();
    for (var i = 0; i < arr.length; i++) {
      someFn(arr[i]);
    }

  • for each cached

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

  • for each cached reversed

     
    var arr = getArr();
    for (var i = arr.length - 1; i >= 0; i--) {
      someFn(arr[i]);
    }