CodeSignal - Character Parity

characterParity.js

/*
Given a character, check if it represents an odd digit, an even digit or not a digit at all.

Example

For symbol = '5', the output should be
characterParity(symbol) = "odd";
For symbol = '8', the output should be
characterParity(symbol) = "even";
For symbol = 'q', the output should be
characterParity(symbol) = "not a digit".
*/

function characterParity(symbol) {
    // Turn the string into a number
    let num = parseInt(symbol, 10);

    // If num is not a number it's a letter
    if(isNaN(num)) {
        return "not a digit";
    }
    else {
        if(num % 2 === 0) {
            return "even";
        }
        else {
            return "odd";
        }
    }
}