SKB — Scala defined type

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Scala Knowledge Bits

2 min readSep 18, 2020

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 SKB — Scala defined type.

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 SKB — Scala defined type !

Let’s make our own type!

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 (MBpSt9KLQECIxOPK8Phaeg).

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

You saw how to parameterize the entire code.

Try change MyType from Int to String.

This seem simple but it is a building block required to understand generic type later.

If you want to start now, try to replace MyType by the following code:

type SubType = Int type MyType = List[SubType]

Do you see how you can combine types together ? Like Lego !

List can be parameterized, we used it with Int and String in the past, but you can use any type you want.

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

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.

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

Originally published at https://leobenkel.com on September 18, 2020.