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Run results for:
for..of, for..in, for, map, forEach
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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
Test name
Executions per second
For of
4952.6 Ops/sec
map
525.7 Ops/sec
forEach
507.0 Ops/sec
for in
292186.5 Ops/sec
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]) }