Run results for: for vs foreach vs for..of vs for..of over entries vs for in vs for cache vs for reverse

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6 Mobile/15E148 Safari/604.1 Lark/7.3.19 LarkLocale/zh_CN ChannelName/Feishu LKBrowserIdentifier/69517845-07D3-403E-8727-4F954B577A51

Browser: Mobile Safari 16

Operating system: iOS 16.6

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
for	76289.3 Ops/sec
foreach	227115.5 Ops/sec
for..of	225399.5 Ops/sec
for..of over entries	86196.3 Ops/sec
for..in	81073.9 Ops/sec
for cache length	105864.0 Ops/sec
for reverse	104617.2 Ops/sec
while	105294.5 Ops/sec

Script Preparation code:

var array = Array.from({length: 100});
var t;

Tests:

for
for (let i = 0; i < array.length; i++) { t = array[i]; }
foreach
array.forEach(function(v, i) { t = v; });
for..of
for (var v of array) { t = v; }
for..of over entries
for (var [i, v] of array.entries()) { t = v; }
for..in
for (var k in array) { t = array[k]; }
for cache length
for (let i = 0,len = array.length; i < len; i++) { t = array[i]; }
for reverse
for (let i = array.length - 1; i >= 0; i--) { t = array[i]; }
while
let i=0,len = array.length while(i < len){ t = array[i] i++ }

Run results for: for vs foreach vs for..of vs for..of over entries vs for in vs for cache vs for reverse

Compare loop performance

for

foreach

for..of

for..of over entries

for..in

for cache length

for reverse

while