spinWords.js

in about Dev on Algorithm

Codewars 알고리즘 풀이


Problem

  • Write a function that takes in a string of one or more words, and returns the same string, but with all five or more letter words reversed.
    • 하나 이상의 단어 문자열을 사용한다.
  • Strings passed in will consist of only letters and spaces.
    • 전달된 문자열은 문자와 공백으로만 구성된다.
  • Spaces will be included only when more than one word is present.
    • 공백은 둘 이상의 단어가 있을 경우에만 포함된다.



Solution 01

function spinWords(str) {
  let arr = str.split(' ');
  
  for (let i = 0; i < arr.length; i++) {
    if (arr[i].length > 4) {
      arr[i] = arr[i].split('').reverse().join('');
    }
  }
  return arr.join(' ');
}

spinWords('abcd');                 // abcd
spinWords('abcde');                // edcba
spinWords('How are you brother');  // How are you rehtorb


Solution 02

function spinWords(str) {
  return str.split(' ').map(i => i.length > 4 ? i.split('').reverse().join('') : i).join(' ');
}

spinWords('abcd');                 // abcd
spinWords('abcde');                // edcba
spinWords('How are you brother');  // How are you rehtorb


Solution 03

function spinWords(str) {
  return str.replcae(/\w{5,}/g, function(word) {
    return word.split('').reverse().join('');
  });
}

spinWords('abcd');                 // abcd
spinWords('abcde');                // edcba
spinWords('How are you brother');  // How are you rehtorb