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Run results for:
typeof x === 'number' vs isNaN(x) F302
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<iframe src="https://measurethat.net/Embed?id=574307" 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/131.0.0.0 Safari/537.36
Browser:
Chrome 131
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
isNaNx2
82.1M/s
isNaNx
71.9M/s
isNaN2
35.9M/s
isNaN
20.8M/s
View exact numbers
Test name
Executions per second
✓
isNaNx2
82,064,080 Ops/sec
isNaNx
71,924,392 Ops/sec
isNaN2
35,941,832 Ops/sec
isNaN
20,833,932 Ops/sec
Script Preparation code:
var myNum = Math.random(); var myString = Math.round(Math.random()*999+888).toString(16); var isNaNx = Number.isNaN;
Tests:
isNaNx
let u = 0; if(isNaNx(myNum))u++; if(isNaNx(myString))u++; if(isNaNx(myNum))u++; if(isNaNx(myString))u++;
isNaN
let u = 0; if(isNaN(myNum))u++; if(isNaN(myString))u++; if(isNaN(myNum))u++; if(isNaN(myString))u++;
isNaN2
let u = 0; const p = (isNaN(myNum) ? 1 : 0) + (isNaN(myString) ? 2 : 0); if(p&1)u++; if(p&2)u++; if(p&1)u++; if(p&2)u++;
isNaNx2
let u = 0; const p = (isNaNx(myNum) ? 1 : 0) + (isNaNx(myString) ? 2 : 0); if(p&1)u++; if(p&2)u++; if(p&1)u++; if(p&2)u++;