Function addLeading

javascript/0066-plus-one.js:28–34

(digits)

};

const addLeading = (digits) => {
    const canCarry = digits[0] === 10;
    if (!canCarry) return;

    digits[0] = 1;
    digits.push(0); /* Space O(N) */
};

/**
 * Time O(N) | Space O(N)