Getting started with recursion for tree traversal

Recursion is a programming technique used to solve problems that can be modeled as recurrence relations or involve recursive data structures, such as filesystems or trees. The process involves defining a base case, determining how to handle individual nodes, and addressing sublist or subtree elements. The text demonstrates recursion through examples, including functions to find, remove, and count occurrences of items in a nested list structure, exemplified by a tree model of New York neighborhoods. Each function follows a similar pattern: defining base cases, handling node and list cases, and making recursive calls to ensure the function reaches its base case. While recursion offers a simpler solution in some cases, it might not always be the most efficient approach. The examples provided serve as a foundation for solving problems involving tree traversal, with further resources suggested for deeper understanding.