Run results for: for vs forEach vs for-of vs for-reverse (short array summing) - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:89.0) Gecko/20100101 Firefox/89.0

Browser: Firefox 89

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
for	44271136.0 Ops/sec
forEach	6242872.5 Ops/sec
for-of	7889826.5 Ops/sec
for-reverse	34802596.0 Ops/sec

Script Preparation code:

var array = Array.from({length: 10}, (_, index) => index);

Tests:

for
var sum = 0 for (var i = 0; i < array.length; i++) { sum += array[i]; }
forEach
var sum = 0 array.forEach(function(item) { sum += item; });
for-of
var sum = 0 for (var item of array) { sum += item; }
for-reverse
var sum = 0 for (var i = array.length; i--;) { sum += array[i]; }

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