Refactoring Elixir for Pure Functions and Testability

Writing maintainable Elixir code requires careful structure, especially when dealing with state and side effects. This course teaches you the principles of functional programming necessary to identify impure functions and systematically refactor them into testable, predictable pure functions using Elixir’s core tools. What you'll learn: * Understand the core differences between pure and impure functions and why purity is essential in concurrent systems. * Apply systematic refactoring techniques to isolate side effects and extract pure computational logic from existing Elixir modules. * Master the use of ExUnit for writing robust and concise unit tests that guarantee the correctness of pure functions. * Practice handling external dependencies and state management safely by separating I/O concerns from core business logic. * Learn to use basic type specifications (@spec) to improve code clarity and assist with static analysis during refactoring. We start with foundational functional programming concepts and definitions. Next, we practice identifying common refactoring targets in Elixir code. Finally, we implement the refactoring steps and confirm correctness using built-in testing tools. This course is designed for beginner to intermediate Elixir developers who want to improve their code quality and understand functional programming design patterns. No advanced knowledge is required, just basic familiarity with Elixir syntax. Start building cleaner, more reliable Elixir systems today.