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=587985" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36
Browser:
Chrome 99
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
typeof
718.7M/s
in
717.5M/s
bool
716.0M/s
undefined
324.3M/s
hasOwnProperty
104.0M/s
View exact numbers
Test name
Executions per second
✓
typeof
718,730,432 Ops/sec
in
717,454,208 Ops/sec
bool
715,997,568 Ops/sec
undefined
324,323,616 Ops/sec
hasOwnProperty
104,045,064 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;