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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=525851" 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/125.0.0.0 Safari/537.36
Browser:
Chrome 125
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
typeof
22.8M/s
bool
22.6M/s
in
21.8M/s
hasOwnProperty
21.1M/s
undefined
8.9M/s
View exact numbers
Test name
Executions per second
✓
typeof
22,756,090 Ops/sec
bool
22,602,428 Ops/sec
in
21,773,524 Ops/sec
hasOwnProperty
21,059,462 Ops/sec
undefined
8,907,869 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;