SKB – Scala String Format


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 String Format.

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 String Format !

Little break from the heavy stuff !

Let’s see an example on how some Java features have been integrated in Scala. Specially about String formatting at the moment.

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 (G0GDlJ2GQ2O9w05HPQycGA).

More information about Scala String Format

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

This SKB is about formatting numbers.

In the first example, we are seeing how to add leading zeros in front of a number. That can be useful when building some UI or dashboard so the alignment is fix no matter how big the number is. Pretty useful and easy to use !

Then formatting Double, how to truncate the decimals as well as adding leading zeros. Play with it to get a good intuition about it.

And finally, getting closer to Java with Locale which allow you to display a number the right way based on the location. Locale can also be used to format dates and currencies ! Feel free to search for more information online and try to implement the code in here.

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


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! 🙂

Leave a Reply

%d bloggers like this: