Sum even numbers

Write a function sumOfEvens(arr), which takes an array arr as an argument. This function should return a sum of every even number in the array.

Instructions

• If the input array is empty or there are no even numbers, then return 0.
• The input array will contain only numbers.

Example test cases

sumOfEvens([1, 1, 1, 2, 2, 2, 3, 3, 3]); // Output: 6
sumOfEvens([]); // Output: 0
sumOfEvens([-5, 0, 5, -4, 1, 6, -3, 2, 7]); // Output: 8

Hint

You can use the built-in method .reduce() or a for loop

Make sure you export the function for writing the tests