plusOne.js

/**
 * @param {number[]} digits
 * @return {number[]}
 */
var plusOne = function (digits) {
    let incrementOne = BigInt(digits.join('')) + BigInt(1)
    let backToArray = incrementOne.toString().split('')
    return backToArray.map(element => parseInt(element))
};


/*
Example 1:

Input: digits = [1,2,3]
Output: [1,2,4]
Explanation: The array represents the integer 123.
Incrementing by one gives 123 + 1 = 124.
Thus, the result should be [1,2,4].
    Example 2:

Input: digits = [4,3,2,1]
Output: [4,3,2,2]
Explanation: The array represents the integer 4321.
Incrementing by one gives 4321 + 1 = 4322.
Thus, the result should be [4,3,2,2].
    Example 3:

Input: digits = [9]
Output: [1,0]
Explanation: The array represents the integer 9.
Incrementing by one gives 9 + 1 = 10.
Thus, the result should be [1,0].*/