[LeetCode] Capitalize the Title

1.문제

You are given a string title consisting of one or more words separated by a single space, where each word consists of English letters. Capitalize the string by changing the capitalization of each word such that:

• If the length of the word is 1 or 2 letters, change all letters to lowercase.
• Otherwise, change the first letter to uppercase and the remaining letters to lowercase.

Return the capitalized title.

1개 이상의 단어들로 이뤄진 문자열인 title이 주어질 때 단어들은 하나의 공백으로 구분되어있다고 한다.

title 의 단어들을 다음 규칙들을 적용하여 변환하는 문제이다.

• 만약 단어의 길이가 2 이하이면 모든 철자는 소문자여야한다.
• 만약 단어의 길이가 3 이상이면 단어의 제일 앞 철자만 대문자이어야 한다.

Example 1

Input: title = "capiTalIze tHe titLe"
Output: "Capitalize The Title"
Explanation:
Since all the words have a length of at least 3, the first letter of each word is uppercase, and the remaining letters are lowercase.

Example 2

Input: title = "First leTTeR of EACH Word"
Output: "First Letter of Each Word"
Explanation:
The word "of" has length 2, so it is all lowercase.
The remaining words have a length of at least 3, so the first letter of each remaining word is uppercase, and the remaining letters are lowercase.

Example 3

Input: title = "i lOve leetcode"
Output: "i Love Leetcode"
Explanation:
The word "i" has length 1, so it is lowercase.
The remaining words have a length of at least 3, so the first letter of each remaining word is uppercase, and the remaining letters are lowercase.

Constraints:

• 1 <= title.length <= 100
• title consists of words separated by a single space without any leading or trailing spaces.
• Each word consists of uppercase and lowercase English letters and is non-empty.

2.풀이

1. 각 단어들을 반복문을 돌면서 길이에 따라 변환해준다.

/**
 * @param {string} title
 * @return {string}
 */
const capitalizeTitle = function (title) {
  title = title.split(" ");

  for (let i = 0; i < title.length; i++) {
    if (title[i].length <= 2) {
      // 단어의 길이가 2 이하이면 소문자로 바꾼다
      title[i] = title[i].toLowerCase();
    } else {
      // 단어의 길이가 3이상이면 앞 철자만 대문자로 바꿔준다.
      title[i] = title[i].toLowerCase();
      let temp = title[i].split("");
      temp.shift();
      temp.unshift(title[i][0].toUpperCase());
      title[i] = temp.join("");
    }
  }

  return title.join(" ");
};

3.결과