Data Structures in Clojure: Binary Search Trees by Max Countryman.
From the post:
So far we have talked about two fundamental and pervasive data structures: linked lists and hash tables. Here again we discuss another important data structure and one that you will find is quite common: trees. Trees offer a powerful way of organizing data and approaching certain problems. In particular, searching and traversal. Whether you know it or not, you no doubt use trees in your programs today. For instance, Clojure’s vectors are backed by a special kind of tree!
Here we will construct our own tree, just like with our linked list and hash table implementations. Specifically, our tree will be a kind of tree known as a Binary Search Tree (BST). Often when someone says tree, they mean a BST.
We will look the basic structure of our tree, how we insert things into it, and how we find them again. Then we will explore traversing, and finally, removing nodes. At the end of this tutorial you will have a basic, functioning Binary Search Tree, which will be the basis for further explorations later on in this series.
Another installment by Max on data structures in Clojure.