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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=622717" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Mobile Safari/537.36
Browser:
Chrome Mobile 143
Operating system:
Android
Device Platform:
Mobile
Date tested:
7 months ago
undefined
94.1M/s
typeof
92.7M/s
bool
86.5M/s
in
84.0M/s
hasOwnProperty
49.6M/s
View exact numbers
Test name
Executions per second
✓
undefined
94,076,496 Ops/sec
typeof
92,650,536 Ops/sec
bool
86,520,248 Ops/sec
in
83,976,072 Ops/sec
hasOwnProperty
49,594,808 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;