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Run results for:
undefined vs. typeof vs. in vs. hasOwn
Object lookup performance
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=577921" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Mobile Safari/537.36
Browser:
Chrome Mobile 131
Operating system:
Android
Device Platform:
Mobile
Date tested:
one year ago
typeof
40.4M/s
bool
39.2M/s
undefined
37.4M/s
in
35.6M/s
hasOwn
19.1M/s
View exact numbers
Test name
Executions per second
✓
typeof
40,375,368 Ops/sec
bool
39,150,148 Ops/sec
undefined
37,448,980 Ops/sec
in
35,642,988 Ops/sec
hasOwn
19,054,142 Ops/sec
Script Preparation code:
const obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };
Tests:
undefined
undefined !== obj.d;
typeof
'undefined' !== typeof obj.d;
in
'd' in obj;
hasOwn
Object.hasOwn(obj, 'd');
bool
!! obj.d;