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Run results for:
Consume Object.entries vs Object.keys vs for..in vs for..of
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Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36
Browser:
Chrome 135
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Object.entries
3574019.8 Ops/sec
for..in
5280320.0 Ops/sec
Object.keys for
5385571.5 Ops/sec
Object.keys for..of
6856946.5 Ops/sec
Object.entries for..of
3530372.0 Ops/sec
Script Preparation code:
var obj = { a: 1, b: 2, c: 3, d: 4, 0: 'a', 1: 'b', str: 'long string', nested: { nested: 0 }, hello: 55.5 };
Tests:
Object.entries
for (let entries = Object.entries(obj), i = entries.length; --i >= 0;) { const [key] = entries[i] window.a = [key, obj[key]] }
for..in
for (const key in obj) { window.a = [key, obj[key]] }
Object.keys for
for (let keyArray = Object.keys(obj), i = keyArray.length, key = keyArray[--i]; i >= 0; key = keyArray[--i]) { window.a = [key, obj[key]] }
Object.keys for..of
for (const key of Object.keys(obj)) { window.a = [key, obj[key]] }
Object.entries for..of
for (const [key] of Object.entries(obj)) { window.a = [key, obj[key]] }