Recursion Basics for Java Developers

Recursion is a way to define a computation in terms of smaller computations of the same shape. Every recursive definition needs two parts:

• a base case (when to stop)
• a step that reduces the problem toward the base case

If you are coming from Java, you probably associate recursion with algorithms class and stack overflows. In Clojure, recursion is still a real tool, but you will also learn safer iteration shapes (reduce, loop/recur) and a strong preference for transforming sequences instead of managing indexes.

The goal of this section is to make recursion feel like a clear design pattern rather than a risky trick.

In this section

• Understanding Recursion in Clojure
  Learn how recursive Clojure functions use base cases and smaller steps, where they resemble Java recursion, and why loop/recur matters for stack safety.
• Recursion vs Iteration in Clojure
  Compare recursion, Java-style iteration, reduce, and loop/recur so you can choose the clearest Clojure iteration shape for each problem.