Problem

Given an array of integers, write a function that returns the sum of the integers.
Example input:
[1, 2, 3, 4, 5]
Example output:
15

Solution

// Solution:

function sum(arr) {
  return arr.reduce((acc, curr) => acc + curr, 0);
}

// Explanation:
// The reduce method is the most optimal solution because it iterates through the array once and returns the sum of the integers.
// The reduce method is also the most readable solution.