Write a function that finds the largest number in an array nums that is also even. If there is no even number, return -1.
nums
-1
largest_even([3, 7, 2, 1, 7, 9, 10, 13]) ➞ 10 largest_even([1, 3, 5, 7]) ➞ -1 largest_even([0, 19, 18973623]) ➞ 0
N/A