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Rules of Pure Functional Programming | Explained with Examples
👋 Hey everyone! Welcome back to the blog. In today’s blog post, we’ll talk about Pure Functional Programming Rules and demonstrate them with examples in Java.
By the end of this post, you’ll understand:
✅ What pure functional programming is
✅ The key rules it follows
✅ How to write Java programs following these rules
For non-members, please read this article on my blog for free: Rules of Pure Functional Programming | Explained with Examples.
Let’s get started! 🚀
1️⃣ What is Pure Functional Programming?
Pure functional programming follows strict rules to ensure that functions are predictable, reusable, and maintainable.
It follows four key principles:
1️⃣ No State — Functions should not store or rely on changing variables.
2️⃣ No Side Effects — Functions should not modify the external state or affect anything outside.
3️⃣ Immutable Variables — Data should not be changed after it is created.
4️⃣ Favor Recursion Over Looping — Loops are avoided in favor of recursive function calls.
Let’s explore these one by one with detailed examples in Java.
