findAverage.js (8kyu 17)

01 Mar 2019 in about Dev on Algorithm

Codewars 알고리즘 풀이

Problem

Write function findAverage() which calculates average of numbers in given list.
- 배열 내 숫자의 평균을 반환한다.

Solution 01

function findAverage(arr) {
  let sum = 0;
  
  for (let i = 0; i < arr.length; i++) {
    sum += arr[i];
  }
  return sum / arr.length;
}

findAverage([1, 2, 3, 4]);       // 2.5 (10 / 4)
findAverage([1, 2, 3, 4, 5]);    // 3 (15 / 5)
findAverage([88, 92, 96, 100]);  // 94 (376 / 4)

Solution 02

function findAverage(arr) {
  let sum = arr.reduce((result, i) => result + i, 0);
  return sum / arr.length;
}

findAverage([1, 2, 3, 4]);       // 2.5 (10 / 4)
findAverage([1, 2, 3, 4, 5]);    // 3 (15 / 5)
findAverage([88, 92, 96, 100]);  // 94 (376 / 4)

reduce() 메소드
배열을 하나의 값으로 줄이고, 그 값을 반환한다.