Java Loops vs Clojure Recursion

Java’s default iteration tools are loops, indexes, and mutable accumulators. Clojure’s defaults are different, but the translation is not “replace every loop with a self-recursive function.”

• Transform data with map / filter / reduce.
• Use loop/recur when you need an explicit, local loop.
• Use recursion directly mainly when the problem shape is naturally recursive (trees, nested structures).

Practical tip: if your Java solution is “for-loop + mutable variable”, your first Clojure translation is usually reduce or a pipeline, not direct recursion.

This section helps you transfer the intent of a loop into a Clojure shape that is idiomatic, stack-safe, easier to test, and easier to compose with the rest of the language.

In this section

• Java Loop Constructs and Clojure Equivalents
  Review how Java for, enhanced for, while, and do-while loops express counting, traversal, accumulation, and conditional repetition, then map each intent to idiomatic Clojure forms.
• Translating Java Loops to Clojure
  Work through Java-to-Clojure loop translations for accumulation, filtering, early exit, indexed traversal, and recursive data so you choose the right Clojure construct instead of mechanically rewriting syntax.
• Trade-Offs of Recursion and Loops
  Compare readability, stack safety, allocation, laziness, performance, and team maintainability when choosing between Java loops, Clojure sequence operations, loop/recur, and direct recursion.