# SKB – Scala Option pattern matching

## Introduction

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 `Option` pattern matching.

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 `Option` pattern matching !

Easy one today.

We are going to see how the concepts of `unapply`, pattern matching and `Option` work together.

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.

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 (PDLP0wHGQKqN5oS2yt6R4g).

## More information about Scala `Option`pattern matching

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

Under the hood `Option` is a sealed trait that we saw before. It has two implementations: `Some` and `None`.

The `Some` has an `unapply` method that let you extract the value out. You can see it being used in `case Some(n) =>`. The `None` do not since it defines the case when the `Option` is empty.

On the pattern matching sides of things, because it is a sealed trait, the compiler knows how many possible cases there are: 2. If you remove the `Some` case or the `None` one, the compiler will give you a warning related to the completeness of the match cases.

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

## Conclusion

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