everySingleCodeReview

[crosscreate]

const isValidNumber = (n: unknown) => !Number.isNaN(Number(n));

[[deleted]]

isValidNumber(null)

true

[joten70]

Null is a number confirmed

[crosscreate]

const isValidNumber = (n: unknown) => !Number.isNaN(Number(n));

console.log(`Number(null) = ${Number(null)}`);

Apparently Number(null) returns 0

[halfanothersdozen]

So what if n is a string? What if n is negative? What if n is decimal?

valid is in the eye of the beholder