Run results for: javascript loops

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/135.0.7049.83 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 135

Operating system: iOS 18.3.2

Device Platform: Mobile

Date tested: 24 days ago

Test name	Executions per second
foreach	235276.0 Ops/sec
for-in	26673.7 Ops/sec
for-of	205696.7 Ops/sec
for	252250.8 Ops/sec
optimized-for	231390.8 Ops/sec

Tests:

foreach

const items = Array.from({length: 1000}, () => Math.floor(Math.random() * 40));
let index = 0;

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

​x
 
const items = Array.from({length: 1000}, () => Math.floor(Math.random() * 40));let index = 0;​items.forEach(i => index++);

for-in

const items = Array.from({length: 1000}, () => Math.floor(Math.random() * 40));
let index = 0;

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

 
const items = Array.from({length: 1000}, () => Math.floor(Math.random() * 40));let index = 0;​for (let i in items) {    index++;}

for-of

const items = Array.from({length: 1000}, () => Math.floor(Math.random() * 40));
let index = 0;

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

 
const items = Array.from({length: 1000}, () => Math.floor(Math.random() * 40));let index = 0;​for (let i of items) {    index++;}

for

const items = Array.from({length: 1000}, () => Math.floor(Math.random() * 40));
let index = 0;

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

 
const items = Array.from({length: 1000}, () => Math.floor(Math.random() * 40));let index = 0;​for(let i = 0; i < items.length; ++i) {  index++;}

optimized-for

const items = Array.from({length: 1000}, () => Math.floor(Math.random() * 40));
let index = 0;

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

 
const items = Array.from({length: 1000}, () => Math.floor(Math.random() * 40));let index = 0;​for(let i = items.length; i > 0; --i) {  index++;}