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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=507963" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 16_7_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 16
Operating system:
iOS 16.7.5
Device Platform:
Mobile
Date tested:
2 years ago
Test name
Executions per second
undefined
1952559.8 Ops/sec
typeof
5960550.0 Ops/sec
in
5906280.5 Ops/sec
hasOwnProperty
5756778.5 Ops/sec
bool
5618466.5 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;