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 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 YaBrowser/19.10.1.238 Yowser/2.5 Safari/537.36

Browser: Yandex Browser 19

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
for	562.7 Ops/sec
for in	703.0 Ops/sec
for of	1583.7 Ops/sec
forEach	600.2 Ops/sec
map	625.9 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); });