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Run results for:
typeof undefined vs undefined equality check vs double-equal
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=523647" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; rv:109.0) Gecko/20100101 Firefox/115.0
Browser:
Firefox 115
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
equality
5584100.0 Ops/sec
typeof
5586317.5 Ops/sec
double-equal
5638271.5 Ops/sec
Script Preparation code:
window.obj = undefined
Tests:
equality
window.obj === undefined
typeof
typeof window.obj === 'undefined'
double-equal
window.obj == undefined