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Run results for:
undefined vs. typeof vs. in vs. hasOwnProperty
Object lookup performance
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=523090" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
Browser:
Chrome 126
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
bool
13.8M/s
typeof
13.8M/s
in
13.8M/s
hasOwnProperty
12.8M/s
undefined
5.5M/s
View exact numbers
Test name
Executions per second
✓
bool
13,844,560 Ops/sec
typeof
13,816,973 Ops/sec
in
13,812,354 Ops/sec
hasOwnProperty
12,754,662 Ops/sec
undefined
5,522,088 Ops/sec
Script Preparation code:
var 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;
hasOwnProperty
obj.hasOwnProperty( 'd' );
bool
!! obj.d;