Run results for: for vs foreach vs some vs for..of without browser optim - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0) Gecko/20100101 Firefox/87.0

Browser: Firefox 87

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
for	5373107.0 Ops/sec
foreach	2189708.0 Ops/sec
some	2163678.0 Ops/sec
for..of	420225.4 Ops/sec
for..in	149860.7 Ops/sec

Website performance monitoring

Script Preparation code:

var array = new Array(100).fill(1);

Tests:

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