Run results for: Array loops: for vs for in vs for of vs forEach vs map [fixed for IE]

Run details:

User agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 YaBrowser/18.9.0.3409 Yowser/2.5 Safari/537.36

Browser: Yandex Browser 18

Operating system: Windows 8.1

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
for	6338444.5 Ops/sec
for in	5762481.5 Ops/sec
for of	6099358.0 Ops/sec
forEach	3016791.0 Ops/sec
map	3080213.5 Ops/sec

Script Preparation code:

var arr = [];
for (let i = 0; i < 1000; i++) {
  arr[i] = i;
}

function foo(bar) {
  return bar;
}

Tests:

for
for (let i = 0, len = arr.length; i < len; i++) { foo(arr[i]); }
for in
for (let i in arr) { foo(arr[i]); }
for of
for (let val of arr) { foo(val); }
forEach
arr.forEach(function(val) { foo(val); });
map
arr.map(function(val) { return foo(val); });