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Run results for:
undefined vs. typeof vs. in vs. hasOwnProperty vs. obj[key]
Object lookup performance
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=608099" 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/134.0.0.0 Safari/537.36 OPR/119.0.0.0
Browser:
Opera 119
Operating system:
Windows
Device Platform:
Desktop
Date tested:
11 months ago
Test name
Executions per second
undefined
239102112.0 Ops/sec
typeof
254191936.0 Ops/sec
in
253378608.0 Ops/sec
hasOwnProperty
159830912.0 Ops/sec
bool
241523968.0 Ops/sec
obj[key]
261477408.0 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;
obj[key]
obj['d']