[Java]프로그래머스 Lv. 0 암호 해독

https://school.programmers.co.kr/learn/courses/30/lessons/120892

프로그래머스

나의 풀이

class Solution {
    public String solution(String cipher, int code) {
        StringBuilder sb = new StringBuilder();
        char[] data = cipher.toCharArray();
        for (int i = code; i < data.length + 1; i+=code){
            sb.append(data[i-1]);
        }
        return sb.toString();
    }
}

다른 풀이

import java.util.stream.Collectors;
import java.util.stream.IntStream;

class Solution {
    public String solution(String cipher, int code) {
        return IntStream.range(0, cipher.length())
                .filter(value -> value % code == code - 1)
                .mapToObj(c -> String.valueOf(cipher.charAt(c)))
                .collect(Collectors.joining());
    }
}