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Run results for:
isNaN(input) vs Number.isNaN(Number(input))
benchmark for using: - implicit conversion of string to number -> isNaN(input) vs - strictness conversion of string to number and after it compare with NaN -> Number.isNaN(Number(input))
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<iframe src="https://measurethat.net/Embed?id=531872" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
Browser:
Chrome 126
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Implicit conversion test
1546049.0 Ops/sec
Strictness conversion test
1094430.0 Ops/sec
Script Preparation code:
function testImplicitConversionStringToNaN(input) { return isNaN(input); } function testStrictnessConversionStringToNaN(input) { return Number.isNaN(Number(input)); }
Tests:
Implicit conversion test
testImplicitConversionStringToNaN('123'); testImplicitConversionStringToNaN('123abc'); testImplicitConversionStringToNaN(NaN); testImplicitConversionStringToNaN(null); testImplicitConversionStringToNaN({}); testImplicitConversionStringToNaN(123);
Strictness conversion test
testStrictnessConversionStringToNaN('123'); testStrictnessConversionStringToNaN('123abc'); testStrictnessConversionStringToNaN(NaN); testStrictnessConversionStringToNaN(null); testStrictnessConversionStringToNaN({}); testStrictnessConversionStringToNaN(123);