The Power of Composition
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Composition — how an application's parts come together, dependencies get wired, and environments boot — is one of 12 essentials for testable, maintainable code. Without intentional composition (a Composition Root), codebases suffer from scattered imports, global state mutation, and untestable code. The post explains what composition is, common anti-patterns developers fall into, the benefits of clean composition (real testability, dependency inversion, multiple boot modes), and how to start fixing it by implementing a layered architecture with a single bootstrap location. Levels of mastery range from everything in one file to a full DI container with composable boot modes.
