Dependency injection in Scala

Let's explore various possible ways of using the Scala language to perform dependency injection without the need for any framework or run-time magic (Looking at you Guice). Just safe compile-time dependency wiring.

Approaches:

• Cake Pattern
• Thin cake pattern
• Constructor Parameter
• Macwire (uses MACROS)
• Abstract dependencies
• Structural typing (as class constructor parameter)
• Implicits
• Reader Monad