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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:78.0) Gecko/20100101 Firefox/78.0

Browser: Firefox 78

Operating system: Mac OS X 10.11

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
for	1201003.0 Ops/sec
for..of	45958.9 Ops/sec
for..in	29168970.0 Ops/sec
forEach	2210921.0 Ops/sec

Website performance monitoring

Script Preparation code:

var array = new Array(100);

Tests:

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