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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=609113" 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/18.3.1 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
typeof
300.2M/s
in
286.7M/s
bool
280.3M/s
undefined
177.6M/s
hasOwnProperty
155.6M/s
View exact numbers
Test name
Executions per second
✓
typeof
300,172,768 Ops/sec
in
286,719,744 Ops/sec
bool
280,341,984 Ops/sec
undefined
177,614,656 Ops/sec
hasOwnProperty
155,586,688 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;