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=490174" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Browser:
Chrome 120
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
typeof
21.9M/s
bool
21.9M/s
in
21.9M/s
hasOwnProperty
19.8M/s
undefined
7.8M/s
View exact numbers
Test name
Executions per second
✓
typeof
21,916,330 Ops/sec
bool
21,910,772 Ops/sec
in
21,900,300 Ops/sec
hasOwnProperty
19,802,996 Ops/sec
undefined
7,764,944 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;