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Run results for:
for-in vs for-of vs object.keys vs object.values to calculate length
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<iframe src="https://measurethat.net/Embed?id=621154" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36
Browser:
Chrome 142
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
5 months ago
Test name
Executions per second
for-in
590097.2 Ops/sec
Object.keys
629079.9 Ops/sec
Object.values
641284.9 Ops/sec
for-of
644362.0 Ops/sec
Script Preparation code:
var obj =[...new Array(10)].map(x=>({id:x,name:x}));
Tests:
for-in
let res = 0; for (var key in obj) { res++; } console.log(res);
Object.keys
console.log(Object.keys(obj).length);
Object.values
console.log(Object.values(obj).length);
for-of
let res = 0; for (var value of obj) { res++; } console.log(res);