https://leetcode.com/problems/plus-one/

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/**
 * @param {number[]} digits
 * @return {number[]}
 */
var plusOne = function(digits) {
    let p = digits.length - 1
    if (p >= 0) {
        let cur = ++digits[p]
        if (cur > 9) {
            digits[p] %= 10
            digits = plusOne(digits.slice(0, p)).concat(digits[p])
        }
        return digits
    }
    return [1]
};

An awesome answer:

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/**
 * @param {number[]} digits
 * @return {number[]}
 */
var plusOne = function(digits) {
    let p = digits.length - 1
    for (let i = p; i >= 0; i--) {
        if (digits[i] < 9) {
            digits[i]++
            return digits
        }
        digits[i] = 0
    }
    digits.unshift(1)
    return digits
};