Introduction
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 Class new.
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 Class new !
Scala is a language that join both worlds “Functional Programming” and “Object Oriented”.
We talked a little bit about “Functional Programming” in the previous SKBs and today we are going to introduce the basics for “Object Oriented” : the classes and more specifically how to create an instance of a class.
We will be diving a bit more into the theory after the exercise.
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.
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 (Yqd2MrzTTJy5OdhDffdyyA).
More information about Scala Class new
In this exercise you will learn (or have learned, if you have already solved the puzzle) about Scala Class new.
A class is a collection of functions that can be reused. This collection is created with parameters and that will make the instance of the class behave differently.
In a lot of programming books, you will see a class being described as a “blueprint”. And using this “blueprint”, you are able to “instantiate”, or build, an object.
The way to build a class in Scala is using the keyword new.
To summarize all the terminology:
- Class: A collection of methods, values. Built with parameter(s). Instantiated to an object via the keyword
new. - Object: An instance of a class built with specific parameters.
- Instantiate: The action of creating an object from a class.
new: The keyword used in Scala to instantiate a class and make an object.- Field: The
valcontained in theclass. - Method: The
def(functions) contained in theclass. - Member: A term to describe both
fieldandmethod.
Feel free to go back to the exercise, modify the code to try out new things
and get a better intuition for Scala Class new.
Conclusion
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! 🙂
No exercise here 🙁 code works from the start
omg ! Good catch ! Thank you !
I always fill the exercise to test it works, and then replace parts with
???, I might have forgotten here.I fixed it !
Thank you again !