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Scala Design Patterns
Scala Design Patterns

Scala Design Patterns: Design modular, clean, and scalable applications by applying proven design patterns in Scala , Second Edition

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Scala Design Patterns

Traits and Mixin Compositions

Before digging into some actual design patterns, we have to make sure that many of the Scala language concepts are clear to the reader. Many of those concepts will later be used in implementing the actual design patterns, and being aware of the possibilities, limitations, and pitfalls are key factors that enable us to correctly and efficiently write code. Even though those concepts are not considered official design patterns, they could still be used to write good software. In some cases, due to the richness of Scala, some concepts could replace a design pattern by just using language features. After all, as we have already said before, design patterns are there because a programming language lacks features and is not rich enough to complete certain tasks.

The first topic that we will look into is about traits and mixin compositions. They provide...

Traits

Many of you might have different perspectives of traits in Scala. They can be viewed not only as interfaces in other languages, but also as classes with only parameter-less constructors.

Trait parameters

The Scala programming language is quite dynamic and has evolved quickly throughout the years. According to the language creators, the Dotty project is the future of Scala and it is a place where passing parameters to traits and many other features are being tested and implemented. The main idea behind it is language simplification, and more information can be found at http://dotty.epfl.ch and https://scala-lang.org/blog/2017/05/31/first-dotty-milestone-release.html.

In the following few sections, we will see the traits from different points of view and try to give you some ideas about how they can be used.

...

Mixin compositions

Scala allows developers to extend many traits in a single class. This adds the possibility of achieving multiple inheritance and saves a lot of effort in code writing, which has to be performed in languages where extending many classes is not allowed. In this subtopic, we will show how traits can be mixed in a specific class or used to create anonymous classes with some specific functionality while writing our code.

Mixing traits in

First of all, let's modify the code from the previous example. It is a really simple change and it will also show exactly how traits can be mixed in:

object MixinRunner extends Ping with Pong {
def main(args: Array[String]): Unit = {
ping()
pong()
}
}

As can be seen...

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Key benefits

  • •Unleash the power of Scala and apply it in the real world to build scalable and robust applications.
  • •Learn about using and implementing Creational, Structural, Behavioral, and Functional design patterns in Scala
  • •Learn how to build scalable and extendable applications efficiently

Description

Design patterns make developers’ lives easier by helping them write great software that is easy to maintain, runs efficiently, and is valuable to the company or people concerned. You’ll learn about the various features of Scala and will be able to apply well-known, industry-proven design patterns in your work. The book starts off by focusing on some of the most interesting and latest features of Scala while using practical real-world examples. We will be learning about IDE’s and Aspect Oriented Programming. We will be looking into different components in Scala. We will also cover the popular "Gang of Four" design patterns and show you how to incorporate functional patterns effectively. The book ends with a practical example that demonstrates how the presented material can be combined in real-life applications. You’ll learn the necessary concepts to build enterprise-grade applications. By the end of this book, you’ll have enough knowledge and understanding to quickly assess problems and come up with elegant solutions.

Who is this book for?

If you want to increase your understanding of Scala and apply design patterns to real-life application development, then this book is for you.Prior knowledge of Scala language is assumed/ expected.

What you will learn

  • Immerse yourself in industry-standard design patterns—structural, creational, and behavioral—to create extraordinary applications
  • See the power of traits and their application in Scala
  • Implement abstract and self types and build clean design patterns
  • Build complex entity relationships using structural design patterns
  • Create applications faster by applying functional design patterns

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Apr 09, 2018
Length: 396 pages
Edition : 2nd
Language : English
ISBN-13 : 9781788471305
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Product Details

Publication date : Apr 09, 2018
Length: 396 pages
Edition : 2nd
Language : English
ISBN-13 : 9781788471305
Category :
Languages :

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Learning Scala Programming
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Table of Contents

13 Chapters
The Design Patterns Out There and Setting Up Your Environment Chevron down icon Chevron up icon
Traits and Mixin Compositions Chevron down icon Chevron up icon
Unification Chevron down icon Chevron up icon
Abstract and Self Types Chevron down icon Chevron up icon
Aspect-Oriented Programming and Components Chevron down icon Chevron up icon
Creational Design Patterns Chevron down icon Chevron up icon
Structural Design Patterns Chevron down icon Chevron up icon
Behavioral Design Patterns – Part One Chevron down icon Chevron up icon
Behavioral Design Patterns – Part Two Chevron down icon Chevron up icon
Functional Design Patterns – the Deep Theory Chevron down icon Chevron up icon
Applying What We Have Learned Chevron down icon Chevron up icon
Real-Life Applications Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

Top Reviews
Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.1
(7 Ratings)
5 star 57.1%
4 star 14.3%
3 star 14.3%
2 star 14.3%
1 star 0%
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Akram Ahmad Aug 22, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
- I read the first edition of this book (Scala Design Patterns, by Ivan Nikolov) cover to cover when it first came out, and was blown away by the high quality of the content, impressed by the clear presentation.- Well, in the second edition of the book, all that is still there, plus several improvements. Frankly, this is one of my all-time favorite (technical) books that has gotten even better :)- Scala Design Patterns is simply a pleasure to read, with copious code illustrating the ideas, remarkable both for its quality and quantity, and one in which Ivan has shared some of the highest quality Scala (production level) that I have seen to date. Marvelous coverage of design patterns can be found therein.- I thought I knew a thing or two about Scala, and therefore was pleasantly surprised to learn a bunch of great ideas to elevate my coding skills and design repertoire!
Amazon Verified review Amazon
Amazon Customer Dec 29, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I am loving it! Very clear code samples and plenty of them. Very easy to read.
Amazon Verified review Amazon
Meysam Nov 16, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book puts all your language knowledge into practice. The examples are short and clear. I highly recommend it.
Amazon Verified review Amazon
Larry Nov 19, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Very good book! Some code was over my head, but that is probably due to my own insufficient knowledge of Scala...I've been studying Scala on and off for a few years as a hobby but never did much of a project yet. After finishing this book, I think I will feel more comfortable with Scala so I can finally do a decent project.I definitely would like to encourage Ivan to write additional Scala books.
Amazon Verified review Amazon
Amazon Customer Aug 21, 2019
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Overall that is good book.
Amazon Verified review Amazon
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