Problem

Given an array of integers, write a function that returns the sum of the odd integers in the array.
Example input:
[1, 2, 3, 4, 5]
Example output:
9

Solution

// Solution:

function sumOdd(arr) {
  let sum = 0;
  for (let i = 0; i < arr.length; i++) {
    if (arr[i] % 2 !== 0) {
      sum += arr[i];
    }
  }
  return sum;
}

// Explanation:

// This solution is optimal because it uses a for loop to iterate through the array and check if each element is odd. If it is, it adds it to the sum. This solution is optimal because it only iterates through the array once, and it doesn't use any extra space.