Find Nth Digit

function findNthDigit(inArr) {
    var number, reg,
        nthDigit;
    reg = RegExp(/\d/g);
    number = inArr[1].toString().match(reg);
    nthDigit = inArr[0];
    if (nthDigit > number.length) {
        return "The number doesn’t have" + nthDigit + " digits";
    }
    nthDigit = number[number.length - (nthDigit)];
    return nthDigit;
}