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Run results for:
typeof undefined vs strict equal vs equal
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Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Browser:
Chrome 122
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
equal null
18.3M/s
typeof
18.3M/s
strict equal undefined
9.5M/s
View exact numbers
Test name
Executions per second
✓
equal null
18,315,988 Ops/sec
typeof
18,288,428 Ops/sec
strict equal undefined
9,515,759 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