Toggle navigation
MeasureThat
.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Run results for:
undefined vs. typeof vs. in vs. hasOwnProperty
Object lookup performance
Go to the benchmark
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=489516" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:120.0) Gecko/20100101 Firefox/120.0
Browser:
Firefox 120
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
2 years ago
hasOwnProperty
655.3M/s
bool
523.9M/s
typeof
408.1M/s
undefined
407.0M/s
in
404.8M/s
View exact numbers
Test name
Executions per second
✓
hasOwnProperty
655,290,624 Ops/sec
bool
523,942,656 Ops/sec
typeof
408,123,488 Ops/sec
undefined
407,017,152 Ops/sec
in
404,819,104 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;