ZLayers by example

In this video, you will learn how to use zio and ZLayers.

The example is to implement a program that interacts with a service Show to display a given message.
I showed 3 different implementations:
- a simple one using println.
- a testable one that appends each line to a state.
Then I built a ZLayer for each implementation and showed how to provide the required layers and how to combine them together.

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