Function getNext

javascript/0202-happy-number.js:19–29

(n, sum = 0)

};

var getNext = (n, sum = 0) => {
    while (0 < n) {
        /* Time O(log(N)) */
        const remainder = n % 10;

        n = Math.floor(n / 10);
        sum += remainder * remainder;
    }

    return sum;
};

/**
 * Hash Set - seen static