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=577517" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36
Browser:
Chrome 121
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
bool
94.9M/s
typeof
91.5M/s
in
90.5M/s
undefined
87.3M/s
hasOwnProperty
52.7M/s
View exact numbers
Test name
Executions per second
✓
bool
94,947,496 Ops/sec
typeof
91,511,208 Ops/sec
in
90,487,224 Ops/sec
undefined
87,266,648 Ops/sec
hasOwnProperty
52,692,856 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;