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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=577645" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
Browser:
Chrome 131
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
in
75.3M/s
bool
74.8M/s
typeof
67.5M/s
undefined
59.6M/s
hasOwn
40.2M/s
View exact numbers
Test name
Executions per second
✓
in
75,347,056 Ops/sec
bool
74,814,464 Ops/sec
typeof
67,513,528 Ops/sec
undefined
59,567,128 Ops/sec
hasOwn
40,237,600 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;