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))

Go to the benchmark

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:126.0) Gecko/20100101 Firefox/126.0

Browser: Firefox 126

Operating system: Windows

Device Platform: Desktop

Date tested: 6 months ago

Test name	Executions per second
Implicit conversion test	3567982.0 Ops/sec
Strictness conversion test	3011479.5 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);

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))

Implicit conversion test

Strictness conversion test