66.js

/** ------------------------------------------------------------------------------
 * 
 * 66. Plus One
 * Topics: Array, Math
 * https://leetcode.com/problems/plus-one/description/?envType=daily-question&envId=2026-01-01
 * 
 ------------------------------------------------------------------------------ */
/**
 * @param {number[]} digits
 * @return {number[]}
 */
var plusOne = function (digits) {
  for (let i = digits.length - 1; i >= 0; i--) {
    if (digits[i] < 9) {
      digits[i]++
      return digits
    }
    digits[i] = 0
  }
  digits.unshift(1)
  return digits
}

console.log(plusOne([1, 2, 3]))
// 단순 String으로 계산시 부동소수점 문제가 발생
console.log(plusOne([6, 1, 4, 5, 3, 9, 0, 1, 9, 5, 1, 8, 6, 7, 0, 5, 5, 4, 3]))