Run results for: for vs while vs for of vs forEach（optimaized - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 months ago

Test name	Executions per second
for i++	30263.5 Ops/sec
for i--	30372.8 Ops/sec
while i--	29740.1 Ops/sec
for of	2729406.0 Ops/sec
forEach	2744189.0 Ops/sec

Script Preparation code:

var arr = []
for (var i = 0; i < 1000; i++) arr[i] = i

Tests:

for i++
var l = arr.length for (var i = 0; i < l; i++) { var a = arr[i] }
for i--
for (var i = arr.length; i >= 0; i--) { var a = arr[i] }
while i--
var i = arr.length while (i--) { var a = arr[i] }
for of
for (var v of arr) { var a = v }
forEach
arr.forEach(v => { var a = v })