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Run results for:
undefined vs. typeof vs. in vs. hasOwnProperty
Object lookup performance
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=552343" 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/128.0.0.0 Safari/537.36
Browser:
Chrome 128
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
typeof
16.9M/s
bool
16.3M/s
in
16.3M/s
hasOwnProperty
15.4M/s
undefined
6.5M/s
View exact numbers
Test name
Executions per second
✓
typeof
16,869,846 Ops/sec
bool
16,349,227 Ops/sec
in
16,281,791 Ops/sec
hasOwnProperty
15,424,825 Ops/sec
undefined
6,535,722 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;