findAverage.js (8kyu 05)

in about Dev on Algorithm

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Description

  • Write a function which calculates average of numbers in given list.
    • 주어진 배열에서 숫자의 평균을 계산한다.


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]);     // 2
findAverage([1, 2, 3, 4]);  // 2.5
findAverage([2, 2, 2, 2]);  // 2


Solution 02

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

findAverage([1, 2, 3]);     // 2
findAverage([1, 2, 3, 4]);  // 2.5
findAverage([2, 2, 2, 2]);  // 2