Run results for: for-vs-foreach-vs-forof - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0

Browser: Firefox 57

Operating system: Windows 8.1

Device Platform: Other

Date tested: 6 years ago

Test name	Executions per second
forEach	310971.2 Ops/sec
for	172709.4 Ops/sec
for of	78710.5 Ops/sec
arrowForEach	261179.6 Ops/sec
forBackward	174095.9 Ops/sec

Script Preparation code:

var arr = [];
for (var i = 0; i < 1000; i++) {
  arr[i] = i;
}
function someFn(i) {
  return i * 3 * 8;
}

Tests:

forEach
arr.forEach(function (item){ someFn(item); });
for
for (var i = 0, len = arr.length; i < len; i++) { someFn(arr[i]); }
for of
for(xxx of arr){ someFn(xxx); }
arrowForEach
arr.forEach((item)=>{ someFn(item); });
forBackward
for (var i=arr.length-1; i>=0; i--) { someFn(arr[i]); }

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