OO in Our Chatbot

Now that you know the theoretical basics, let's look at these facilities and how they are used in our program. Let's open Lesson 2/3-project in our IDE and extend our chatbot, which was developed in the previous chapter.

Decoupling Logic and Environment

To do this, we must decouple the environment and logic, and integrate only one in the main method.

Let's open the EffectsProvider class:

Note

For full code, refer to Code Snippets/Lesson 2.scala file.

trait EffectsProvider extends TimeProvider {

 def input: UserInput

 def output: UserOutput

}

object DefaultEffects extends EffectsProvider
{
 override def input: UserInput = ConsoleInput

 override def output: UserOutput = ConsoleOutput

 override def currentTime(): LocalTime = LocalTime.now()

 override def currentDate(): LocalDate = LocalDate.now()
}

Here, we encapsulate all of the effects into our traits, which can have different implementations.

For example, let's look at UserOutput:

For full...