There is no way that any Javascript library function is "more optimized" than just using `n % 2`, which is also plenty descriptive.

If this is very performance sensitive you can try using the somewhat more obscure (because many people have minimal experience with bitwise operators) `n & 1` instead.

Given an integer input, thare are no "edge cases" to worry about here. If you expect floating point inputs, you need to think carefully about what the correct output should be anyway. A library isn’t going to save you.

(If your "edge case" is that someone might want to know whether a string is even or odd... well, you have other problems.)