[프로그래머스]실패율

문제확인

https://programmers.co.kr/learn/courses/30/lessons/42889

문제풀이

function solution(N, stages) {
  var answer = [];
  let rate = 0;

  for (let i = 1; i <= N; i++) {
    let challenger = stages.filter(el => i <= el).length;
    let failer = stages.filter(el => i === el).length;

    if(challenger === 0 || failer === 0) rate = 0;
    else rate = failer / challenger;

    answer.push({stage : i, rate : rate});

    answer.sort((a, b) => {
      if (b.rate === a.rate) {
        return a.rate - b.rate;
      } else {
      return b.rate - a.rate;
      }
    });
  } 
  return answer.map((el) => el.stage);
}