Challenge 1: Length of a Linked List

Problem Statement

Implement a function that takes a linked list testVariable and returns the length of the linked list.

Write your code in the space provided in the file index.js.

Input

1. A variable testVariable containing the linked list whose length will be calculated.
2. The head node of the linked list head.

Output

Length of the input linked list

Sample Input

testVariable => 4 -> 3 -> 11 -> 7 -> null
head => 4

Sample Output

4

Try it Yourself

Try this challenge yourself before examining the solution. Good luck!