Scala Design Patterns - Second Edition

Scala alternatives

As with anything in software engineering, this design pattern could also be achieved using different approaches. Which one to use really boils down to the requirements and specific features of the application and objects being created. Some possible alternatives include the following:

• Passing the needed components to the class that needs them in the constructor (object composition). This, however, would mean that these components will be specific instances rather than new ones, every time a request for them is made.
• Passing a function that will create the objects we need.

Using the richness of Scala, we can avoid this design pattern or we can just be smarter about how we create the objects that we will be using or exposing ...