Benchmark: for-vs-foreach-vs-forof - MeasureThat.net

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(someFn);
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]); }
reverse while
var i = arr.length; while (i--) { someFn(arr[i]); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
forEach
for
for of
arrowForEach
forBackward
reverse while

Fastest: N/A

Slowest: N/A

ⓘ Get performance results from real users on your website with Request Metrics.

Website Performance Monitoring by Request Metrics

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36

Browser/OS: Chrome 63 on Windows 7

View result in a separate tab

Test name	Executions per second
forEach	57075.6 Ops/sec
for	2920.4 Ops/sec
for of	1039.2 Ops/sec
arrowForEach	3916.8 Ops/sec
forBackward	3238.7 Ops/sec
reverse while	3709.2 Ops/sec