Write a function called calculateAverage which accepts an array of numbers. The function should return the average or mean of all numbers in the array is empty 0. code example

Example: average of an array js

const avg = arr => {
  const sum = arr.reduce((acc, cur) => acc + cur);
  const average = sum/arr.length;
  return average;
}

console.log(avg([1, 2, 3, 7, 8]));