평균 구하기

평균 구하기

문제 설명

정수를 담고 있는 배열 arr의 평균값을 return하는 함수, solution을 완성해보세요.

제한 사항

  • arr은 길이 1 이상, 100 이하인 배열입니다.
  • arr의 원소는 -10,000 이상 10,000 이하인 정수입니다.

입출력 예

arr return
[1,2,3,4] 2.5
[5,5] 5

Solution


1
2
3
function solution(arr) {
return arr.reduce((target, item) => { return target + item; }, 0) / arr.length;
}
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