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Run results for:
typeof undefined vs strict equal vs equal
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<iframe src="https://measurethat.net/Embed?id=490957" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Browser:
Chrome 120
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
typeof
9.9M/s
equal null
9.7M/s
strict equal undefined
5.0M/s
View exact numbers
Test name
Executions per second
✓
typeof
9,930,721 Ops/sec
equal null
9,693,491 Ops/sec
strict equal undefined
5,040,259 Ops/sec
Tests:
typeof
var foo = undefined; typeof foo === "undefined";
strict equal undefined
var foo = undefined; foo === undefined
equal null
var foo = undefined; foo == null