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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=541729" 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
bool
21.1M/s
typeof
20.9M/s
in
20.9M/s
hasOwnProperty
17.8M/s
undefined
8.4M/s
View exact numbers
Test name
Executions per second
✓
bool
21,090,524 Ops/sec
typeof
20,881,302 Ops/sec
in
20,865,560 Ops/sec
hasOwnProperty
17,800,714 Ops/sec
undefined
8,372,778 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;