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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=558128" 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/129.0.0.0 Safari/537.36
Browser:
Chrome 129
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
bool
30.9M/s
typeof
26.9M/s
in
26.6M/s
hasOwnProperty
25.4M/s
undefined
9.9M/s
View exact numbers
Test name
Executions per second
✓
bool
30,902,304 Ops/sec
typeof
26,899,148 Ops/sec
in
26,591,850 Ops/sec
hasOwnProperty
25,393,126 Ops/sec
undefined
9,871,730 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;