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=600423" 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/135.0.0.0 Safari/537.36 Edg/135.0.0.0
Browser:
Chrome 135
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
undefined
89.2M/s
typeof
89.2M/s
in
87.1M/s
operator
85.3M/s
bool
82.8M/s
View exact numbers
Test name
Executions per second
✓
undefined
89,231,552 Ops/sec
typeof
89,163,272 Ops/sec
in
87,133,264 Ops/sec
operator
85,251,144 Ops/sec
bool
82,815,928 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;