Plus One | LeetCode 66

[Written explanation will be added soon]

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Here is the full implementation.

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

  digits.unshift(1);
  return digits;
};