How to Structure an Elixir Project Using Mix: A Practical Guide

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As Elixir projects grow beyond a few modules, managing code in IEx sessions becomes impractical due to redefinition warnings and name collisions. Mix, Elixir's built-in build tool, solves this by generating a standard project skeleton that handles compilation, testing, and dependency management. A typical Mix project organizes application code under lib/, with file paths and directory names mirroring module names — for example, LearningElixir.TodoList maps to lib/learning_elixir/todo_list.ex. Non-code assets go in priv/, while config/ separates environment-specific settings for dev, test, and prod. Although the Elixir compiler does not enforce these conventions, virtually all Elixir projects follow them, making the codebase easier to navigate and maintain as it scales.

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