Run results for: loops-perf

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3833.89 Safari/537.36

Browser: Chrome 77

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

HTML Preparation code:

<script>
  var arr = new Array(250);
  var out = new Array(250);
</script>

Script Preparation code:

arr.fill(Math.random());
out.length = 0;

Tests:

for of
for (const item of arr) { out.push(item); }
for in
for (const i in arr) { out.push(arr[i]); }
for
for (var i = 0; i < arr.length; ++i) { out.push(arr[i]); }
while
var i = 0; while (i < arr.length) { out.push(arr[i]); i++; }
forEach() with function
arr.forEach(function(x) { out.push(x); });
forEach() with closure
arr.forEach(x => out.push(x));
for, reversed
for (var i = arr.length; i--;) { out.push(arr[i]); }
for, cached length
for (var i = 0, len = arr.length; i < len; ++i) { out.push(arr[i]); }
while, reversed
var i = arr.length; while (i-- > 0) { arr[i]; }
while, cached length
var i = 0; var len = arr.length; while (i < len) { out.push(arr[i]); i++; }