Run results for: for vs foreach vs some vs for...of

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

for...of

99K/s

foreach

70K/s

some

49K/s

foreach key

1K/s

for...in

1K/s

for

715/s

View exact numbers

Script Preparation code:

var array = new Array(10000);
for(let i = 0; i < array.length; i++) {
 array[i] = i; 
}

Tests:

for
var a = 0; for(let i = 0; i < array.length; i++) { a += array[i]; } console.log(a);
foreach
var a = 0; array.forEach(el => {a += el}); console.log(a);
some
var a = 0; array.some(el => {a += el}); console.log(a);
for...of
var a = 0; for(let i of array) { a += i; } console.log(a);
for...in
var a = 0; for(let i in array) { a += array[i]; } console.log(a);
foreach key
var a = 0; array.forEach((el, key) => {a += array[key]}); console.log(a);