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Run results for:
for-in vs for of vs object.keys vs object.entries
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Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
10 months ago
Test name
Executions per second
for-in
48827396.0 Ops/sec
Object.keys - forEach
23559790.0 Ops/sec
Object.keys - for loop
31982956.0 Ops/sec
for of - Object.keys
28144828.0 Ops/sec
for of - Object.entries
5071969.5 Ops/sec
Script Preparation code:
var obj = { 'a': 1, 'b': 1, 'c': 1, 'd': 1, 'e': 1, 'f': 1, 'g': 1 };
Tests:
for-in
let result; for (var key in obj) { result += obj[key]; }
Object.keys - forEach
let result; Object.keys(obj).forEach(key => { result += obj[key]; });
Object.keys - for loop
let result; const keys = Object.keys(obj); for (let i = 0; i < keys.length; i++) { result += obj[keys[i]]; }
for of - Object.keys
let result; for (const key of Object.keys(obj)) { result += obj[key]; }
for of - Object.entries
let result; for (const [key, value] of Object.entries(obj)) { result += value; }