Toggle navigation
MeasureThat
.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Run results for:
undefined vs. typeof vs. in vs. operator
Object lookup performance
Go to the benchmark
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=510466" 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/122.0.0.0 Safari/537.36
Browser:
Chrome 122
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
in
16.8M/s
operator
16.6M/s
bool
16.6M/s
typeof
16.3M/s
undefined
6.4M/s
View exact numbers
Test name
Executions per second
✓
in
16,779,048 Ops/sec
operator
16,609,494 Ops/sec
bool
16,564,835 Ops/sec
typeof
16,250,241 Ops/sec
undefined
6,400,444 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;
operator
obj.d >= 0;
bool
!! obj.d;