SKB – Scala case object

SKB – Scala case object

Introduction

This article is part of the Scala knowledge bits Series.

Periodically, I will publish new exercises so you can slowly build up knowledge about Scala.

It is designed to be done in a very short amount of time and learn a little bit each day, just to create a routine.

This episode will teach you about Scala case object.

Hope you are going to enjoy it! It is designed for anyone to learn Scala from scratch and slowly learn, one Bit at a time.

After this Bit, I would love to hear your feedback in the comments down below.

Feel free to join the Discord server as well if you would like some help and support from the rest of our community.

What are we learning today?

Today we are going to learn about Scala case object !

This one should be pretty quick.

Introducing case object.

Time to try on the exercise on your own and scroll down for more information when you are done or if you are stuck.

Exercise

Here is an exercise to complete today.

If I did my job well, you should be able to guess by yourself the solution based on what you previously learned and based on the clues.

But if you get stuck, scroll down to get more information.

The goal of the exercise is to replace the ??? by a piece of code so that the exercise compiles and that’s how you win! Good luck!

You can fill the exercise right in here:

Or, if it does not load, go on to Scastie (vzjyjr0WSTOskKtlV1EoDQ).

More information about Scala case object

In this exercise you will learn (or have learned, if you have already solved the puzzle) about Scala case object.

There is not much to it at first sight. It is the equivalent of what case class is for class but for object.

A case object has everything a object have. Feel free to go back to the corresponding episode. But add also some convenient method. For instance the `toString is a lot nicer, allowing you to get the name of the case object itself which allow for great logging.

It was not easy to introduce only case object because their main use case is in the implementation of the Scala v2.x Enumerations which we are going to see next time. I wanted a dedicated episode to Enumeration but couldn’t go for it until case object were introduced. Now that it is done, see you next time.

Feel free to go back to the exercise, modify the code to try out new things and get a better intuition for Scala case object.

Conclusion

I hope you have learned something new or had fun during this Scala Knowledge Bit.

Please ask questions or post feedback in the comments below.

Feel free to try on the next Scala Knowledege Bit.

If you are curious about the previous Scala knowledge Bits, go check it out! 🙂

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