SKB – Scala Map for List


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 map for List .

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 map for List !

Ready for our first dive into Functional Programming? Don’t worry, we are going through this adventure together and I will make sure you don’t get lost.

This is the moment where you might hear about Monad, Monoid, Functors, but we are not doing any of that today. Today we are just learning about a function from the standard library called map. We can put fancy names on it later.

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 (mqPBMWVGR5OIpa1J9etlYw).

More information about Scala map for List

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

You might have understood that map is actually just like a for each from other languages.

If you don’t know about it from other language, not to worry.

map will just apply a function to each element of the list and return the list with the new values.

If you have a list of type A and you apply a function that transforms a type A to a type B then you will have an output being a list of type B.

That’s it ! You did well for a first dive into Functional Programming. In upcoming SKBs we will go deeper into this aspect of Scala.

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


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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