Exercise: Count Even Integers in a List

Problem Statement

You must implement the countEven() function which counts the number of even integers in a list. Since a list can’t be iterated like an array, you must use pattern matching and recursion to solve this problem.

Sample Input

list = [10, 3, 17, 23, 40, 22, 99]

Sample Output

3

Coding Challenge

Think carefully about the logic behind this exercise before moving on to the actual implementation. We already know that a list can be destructured into its head and ...tail. Use this to create the required function.

If you feel stuck, you can always refer to the solution review in the next lesson.

Good luck!