Run results for: for..of, for..in, for, map, forEach

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

for in

292K/s

For of

5K/s

map

526/s

forEach

507/s

View exact numbers

Script Preparation code:

const arr = new Array(100).fill(1);
const obj = {
    ...arr.reduce((acc, curr) => {
        acc[curr] = curr;
        return acc;
    }, {})
}

Tests:

For of
const arr = new Array(100).fill(1); for (const item of arr) { console.log(item) }
map
const arr = new Array(100).fill(1); arr.map(console.log)
forEach
const arr = new Array(100).fill(1); arr.forEach(console.log)
for in
const arr = new Array(100).fill(1); const obj = { ...arr.reduce((acc, curr) => { acc[curr] = curr; return acc; }, {}) } for (const item in obj) { console.log(obj[item]) }