Return the sum of the elements in an array.

Problem

Given an array of integers, return the sum of the elements in the array.
Input: [1, 2, 3]
Output: 6

Solution

This solution is in JavaScript. Our A.I. can create solutions in multiple languages.

kayakane

// Solution:

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

// This solution is optimal because it is O(n) time complexity.
// It is O(n) because the time it takes to run the function is directly proportional to the size of the input.
// The function will run once for each element in the array.