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Exploring Functional Domain Modeling Techniques in Elixir
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Source: katafrakt.me
The article by Paweł Świątkowski investigates the application of functional domain modeling methods to create clean and efficient Elixir code. It begins with common issues observed in Elixir codebases, such as tightly coupled modules and a mix of technical and domain concerns. Paweł then introduces the concept of functional domain modeling, which consists of pure functions and immutable data types - a natural fit for Elixir. He emphasizes this approach enables focusing on domain requirements without side effects from mutable state or external dependencies. To demonstrate, Paweł redesigns a book borrowing function from a library system by removing dependencies on IDs and external states. He simplifies the function by using only the essential domain knowledge required to make a borrowing decision, such as subscription status, the number of borrowed books, and unpaid fines. This approach leads to a more testable, less coupled, and domain-focused implementation. The article concludes by highlighting the benefits of functional domain modeling in Elixir, which include improved testability, a separation of concerns, and flexible adaptability to domain changes.
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