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=541736" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Mobile Safari/537.36
Browser:
Chrome Mobile 127
Operating system:
Android
Device Platform:
Mobile
Date tested:
one year ago
typeof
12.9M/s
in
12.8M/s
bool
12.8M/s
hasOwnProperty
11.8M/s
undefined
5.0M/s
View exact numbers
Test name
Executions per second
✓
typeof
12,852,750 Ops/sec
in
12,841,024 Ops/sec
bool
12,806,386 Ops/sec
hasOwnProperty
11,752,626 Ops/sec
undefined
5,015,842 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;