Run results for: for vs foreach vs for..in vs for..of - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/109.0

Browser: Firefox 109

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
for	7716616.0 Ops/sec
forEach	1.4 Ops/sec
for in	49629.7 Ops/sec
for of	0.3 Ops/sec

Website performance monitoring

Script Preparation code:

var array = [...new Array(100).keys()].map((_, i) => i);

Tests:

for
for (var i = 0; i < array.length; i++) { array[i] += 1; }
forEach
array.forEach(function(i) { array[i] += 1; });
for in
for (var i in array) { array[i] += 1; }
for of
for (var i of array) { array[i] += 1; }