Dependency Injection — Composition Root

The composition root pattern is (in my opinion) the next evolutionary step after learning dependency injection. Once you fully understand dependency injection, you are able to introduce the next logical steps; predictability and structure around how dependencies are managed. Composition Root brings this to the front of the line, and gives engineers confidence around the structure of their application and how data flows. This is one of those patterns that give you the feeling “oh my god, why didn’t I think of this, why isn’t this how everything is structured?”.

Read more: https://medium.com/@cfryerdev/dependency-injection-composition-root-418a1bb19130

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