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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=557704" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
bool
31.6M/s
typeof
31.6M/s
in
31.4M/s
hasOwnProperty
31.2M/s
undefined
11.1M/s
View exact numbers
Test name
Executions per second
✓
bool
31,622,028 Ops/sec
typeof
31,603,956 Ops/sec
in
31,429,536 Ops/sec
hasOwnProperty
31,246,438 Ops/sec
undefined
11,109,104 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;