CodeFights column additition challenge

function numberOfCarries(a, b) {
    r = 0;
    g = 0;
    d = 10;
    while (a || b > 0) {
        if (a % d + b % d + r >= d) {
            r = 1;
            g++;
        } else {
            r = 0;
        }
        a /= d | 0;
        b = b / d | 0;
    }
    return g;
}