SKB – Scala trait


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 trait.

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 trait !

trait are like interface from other languages.

Have fun with it !

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


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 (PcemiDBSR1ejWZaPaVxjqQ).

More information about Scala trait

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

trait allows you to describe what a class should look like.

You can implement functions that can be overridden. You can describe functions that have to be overridden.

New terms:

  • to inherit: the action of extending a class
  • Child: the class that inherit from a trait
  • Parent: the class that is inherited from

Several new keywords today:

  • extends: is the keyword to be able to inherit from a class
  • override: tell that this element has been overridden.
  • final: tell that this cannot be overridden
  • protected: similar to private but allow the child class to see this element. private would not allow the child to see it.

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


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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