Run results for: for vs foreach vs for..in vs for..of zzz4

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36 Edg/128.0.0.0

Browser: Chrome 128

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

for..of

12K/s

foreach

2K/s

for in

330/s

for

213/s

for2

212/s

View exact numbers

Script Preparation code:

var array = new Array(100000);
for (let i = 0; i < 100000; ++i) {
  array[i] = i;
}

Tests:

for
let s = 0; for (var i = 0; i < array.length; i++) { s+=array[i]; } console.log(s)
foreach
let s = 0; array.forEach(function(n) { s+=n; }); console.log(s)
for in
let s = 0; for (const n in array) { s+=n; } console.log(s)
for..of
let s = 0; for (const n of array) { s+=n; } console.log(s)
for2
let s = 0; for (let i = 0; i < array.length; i++) { s+=array[i]; } console.log(s)