Run results for: javascript loops (bigger loops)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:131.0) Gecko/20100101 Firefox/131.0

Browser: Firefox 131

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 5 months ago

Test name	Executions per second
foreach	68.6 Ops/sec
for-in	27.8 Ops/sec
for-of	77.6 Ops/sec
for	93.9 Ops/sec
optimized-for	94.4 Ops/sec

Tests:

foreach

const items = Array.from({length: 1000000}, () => Math.floor(Math.random() * 40));
let index = 0;

items.forEach(i => index++);

​x
 
const items = Array.from({length: 1000000}, () => Math.floor(Math.random() * 40));let index = 0;​items.forEach(i => index++);

for-in

const items = Array.from({length: 1000000}, () => Math.floor(Math.random() * 40));
let index = 0;

for (let i in items) {
    index++;
}

 
const items = Array.from({length: 1000000}, () => Math.floor(Math.random() * 40));let index = 0;​for (let i in items) {    index++;}

for-of

const items = Array.from({length: 1000000}, () => Math.floor(Math.random() * 40));
let index = 0;

for (let i of items) {
    index++;
}

 
const items = Array.from({length: 1000000}, () => Math.floor(Math.random() * 40));let index = 0;​for (let i of items) {    index++;}

for

const items = Array.from({length: 1000000}, () => Math.floor(Math.random() * 40));
let index = 0;

for(let i = 0; i < items.length; ++i) {
  index++;
}

 
const items = Array.from({length: 1000000}, () => Math.floor(Math.random() * 40));let index = 0;​for(let i = 0; i < items.length; ++i) {  index++;}

optimized-for

const items = Array.from({length: 1000000}, () => Math.floor(Math.random() * 40));
let index = 0;

for(let i = items.length; i > 0; --i) {
  index++;
}

 
const items = Array.from({length: 1000000}, () => Math.floor(Math.random() * 40));let index = 0;​for(let i = items.length; i > 0; --i) {  index++;}