Run results for: javascript loops performance - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.5112.102 Safari/537.36

Browser: Chrome 104

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
for	40.7 Ops/sec
for_in	34.0 Ops/sec
for_of	89.0 Ops/sec
forEach	84.9 Ops/sec
map	79.5 Ops/sec
while	35.8 Ops/sec

Script Preparation code:

var arr = new Array(100000).fill(Math.random());
var lastValue = 0;

Tests:

for
for (var i = 0; i < arr.length; i++) { lastValue = arr[i]; }
for_in
for (var i in arr) { lastValue = arr[i]; }
for_of
for (var v of arr) { lastValue = v; }
forEach
arr.forEach(v => lastValue = v);
map
arr.map(v => lastValue = v);
while
let i = 0; while(i < arr.length) { lastValue = arr[i]; i++; }

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