Problem

Given an array of integers, find the sum of its elements.
Example input: [1, 2, 3, 4, 5]
Example output: 15

Solution

// Solution:

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

// Explanation:
// This solution is optimal because it uses a for loop to iterate through the array and add each element to the sum variable.
// The for loop is the most efficient way to iterate through an array.
// The sum variable is initialized to 0 and then incremented by the value of each element in the array.
// The sum variable is then returned.