Run results for: JS loops and iterators + reverse

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:151.0) Gecko/20100101 Firefox/151.0

Browser: Firefox 151

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one month ago

Test name

Executions per second

✓ Classic for loop

964,177 Ops/sec

Optimised classic for loop

961,615 Ops/sec

while - reverse loop

909,171 Ops/sec

For - reverse loop

688,208 Ops/sec

While loop

652,843 Ops/sec

Optimised while loop

646,134 Ops/sec

Array.prototype.reduce

182,633 Ops/sec

Array.prototype.forEach

177,078 Ops/sec

For - of loop

142,444 Ops/sec

For - in loop

18,292 Ops/sec

Tests:

Classic for loop
let sum = 0; for (let i=0; i < array.length; i++) { sum += array[i]; }
Optimised classic for loop
let sum = 0; for (let i=0, len=array.length; i < len; i++) { sum += array[i]; }
While loop
let sum = 0; let i = 0; while (i < array.length) { sum += array[i]; i++; }
Optimised while loop
let sum = 0; let i = 0; let len = array.length; while (i < len) { sum += array[i]; i++; }
Array.prototype.forEach
let sum = 0; array.forEach(num => sum += num);
Array.prototype.reduce
const sum = array.reduce((acc, el) => acc + el, 0);
For - of loop
let sum = 0; for (let el of array) { sum += el; }
For - in loop
let sum = 0; for (let i in array) { sum += array[i]; }
For - reverse loop
let sum = 0; for (let i=array.length - 1; i >= 0; i--) { sum += array[i]; }
while - reverse loop
let sum = 0; let i = array.length - 1; while (i >= 0) { sum += array[i]; i--; }