Count the specific letter occurrence in a string with the string and letter being a parameter each

bean-counter.js

// Bean Counter
// Determine how many matching letters there are in an input string from an input character
function countChar(stringInput, charSelect) {

    stringInput = String(stringInput);
    let letterArray = Array.from(stringInput), count = 0;

    letterArray.forEach(letter => {
        if (letter == charSelect) {
            count++;
        };
    });
    return count;
}