Run results for: javascript loops performance

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_6_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.6.1

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
for	50.2 Ops/sec
for_in	44.0 Ops/sec
for_of	128.8 Ops/sec
forEach	119.5 Ops/sec
map	122.6 Ops/sec
while	50.6 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++; }

Run results for: javascript loops performance

test js each loops performance

for

for_in

for_of

forEach

map

while