#989 - Add to Array-Form of Integer

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Problem Description

For a non-negative integer X, the array-form of X is an array of its digits in left to right order.

For example, if X = 1231, then the array form is [1,2,3,1].

Given the array-form A of a non-negative integer X, return the array-form of the integer X+K.

Solution

/**
 * @param {number[]} A
 * @param {number} K
 * @return {number[]}
 */
var addToArrayForm = function(A, K) {
  return String(BigInt(A.join('')) + BigInt(K)).split('');
};