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Run results for:
typeof undefined vs. equals
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<iframe src="https://measurethat.net/Embed?id=606058" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:139.0) Gecko/20100101 Firefox/139.0
Browser:
Firefox 139
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
typeof
1575757312.0 Ops/sec
strict equal undefined
1584654336.0 Ops/sec
Tests:
typeof
const foo = "hello"; const defined = typeof foo !== "undefined";
strict equal undefined
const foo = "hello"; const defined = foo !== undefined;