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Hands-On Design Patterns and Best Practices with Julia
Hands-On Design Patterns and Best Practices with Julia

Hands-On Design Patterns and Best Practices with Julia: Proven solutions to common problems in software design for Julia 1.x

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Hands-On Design Patterns and Best Practices with Julia

Design Patterns and Related Principles

Nowadays, learning and applying design patterns is an important aspect of software engineering. Design patterns are like water – you can't live without them. Don't believe me? Just ask hiring managers, and you will find that many of them have design patterns in their job postings as well as related questions in job interviews. It is a common belief that design patterns are important ingredients for software development and everyone should know them.

In this chapter, we will provide some context about why design patterns are useful and how they have served us well in the past few decades. By understanding the motivation behind design patterns, we will be able to set forth a set of guiding principles for developing software. The following topics will be discussed in this chapter:

  • The history of design patterns 
  • Software...

The history of design patterns

Design patterns is not a new concept to computer programmers. Since personal computers became more affordable and popular in the 1980s, the programming profession flourished and a lot of code was written for a variety of applications.

I remember that, when I was 14 years old, learning the GOTO statement for a BASIC program was one of the coolest things. It literally allowed me to take a control flow to a different part of the code at any time. Perhaps not too surprisingly, when I learned about structured programming and the Pascal language in college, I started to realize how GOTO statements produce messy spaghetti code. Using GOTO for branching purposes is a pattern. It's just a bad one because it makes code difficult to understand, follow, and debug. In today's lingua franca, we call them anti-patterns. When it comes to...

Software design principles

While this book does not cover object-oriented programming, some object-oriented design principles are universal and could be applied to any programming language and paradigm. Here, we will take a look at some of the most well-known design principles. In particular, we will cover the following:

  • SOLID: Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion
  • DRY: Don't Repeat Yourself
  • KISS: Keep It Simple, Stupid!
  • POLA: Principle of Least Astonishment
  • YAGNI: You Aren't Gonna Need It
  • POLP: Principle of Least Privilege

Let's start with SOLID.

SOLID

The SOLID principle consists of the following:

  • S: Single Responsibility Principle
  • O: Open...

Software quality objectives

Everyone likes beautiful design. I do, too. But, the use of design patterns is not just to make something look good. Everything we do should have a purpose.

The GoF classified object-oriented design patterns as creational, structural, and behavioral. For Julia, let's take a different perspective and classify our patterns by their respective software quality objectives as follows:

  • Reusability
  • Performance
  • Maintenance
  • Safety

Let's understand each of these in the following sections.

Reusability

People often talk about top-down and bottom-up approaches when designing software.

The top-down approach starts with a large problem and breaks it down into a set of smaller problems. Then, if the...

Summary

In this chapter, we started by going back in time and reviewing the history of design patterns. We discussed why design patterns can be useful for software professionals and how we would like to organize design patterns in this book given what we have learned in the past. 

We went over several key software design principles that can be applied universally in any programming language, as it is important that we keep them in mind when developing code and applying design patterns in Julia. We covered SOLID, DRY, KISS, POLA, YAGNI, and POLP. These design principles are well known and well received by the object-oriented programming community.

Finally, we discussed some software quality objectives that we want to achieve by using design patterns. In this book, we have decided to focus on reusability, maintainability, performance, and safety objectives. We also appreciated...

Questions

Review the following questions to reinforce your understanding of the subjects in this chapter. Answers are provided at the back of the book:

  1. What are the benefits of using design patterns?
  2. Name some key design principles.
  3. What problem does the Open/Closed Principle solve?
  4. Why is interface segregation important for software reusability?
  5. What are the simplest ways to keep an application maintainable?
  6. What is a good practice for avoiding over-engineered and bloated software?
  7. How does memory usage affect system performance?
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Key benefits

  • Explore useful design patterns along with object-oriented programming in Julia 1.0
  • Implement macros and metaprogramming techniques to make your code faster, concise, and efficient
  • Develop the skills necessary to implement design patterns for creating robust and maintainable applications

Description

Design patterns are fundamental techniques for developing reusable and maintainable code. They provide a set of proven solutions that allow developers to solve problems in software development quickly. This book will demonstrate how to leverage design patterns with real-world applications. Starting with an overview of design patterns and best practices in application design, you'll learn about some of the most fundamental Julia features such as modules, data types, functions/interfaces, and metaprogramming. You'll then get to grips with the modern Julia design patterns for building large-scale applications with a focus on performance, reusability, robustness, and maintainability. The book also covers anti-patterns and how to avoid common mistakes and pitfalls in development. You'll see how traditional object-oriented patterns can be implemented differently and more effectively in Julia. Finally, you'll explore various use cases and examples, such as how expert Julia developers use design patterns in their open source packages. By the end of this Julia programming book, you'll have learned methods to improve software design, extensibility, and reusability, and be able to use design patterns efficiently to overcome common challenges in software development.

Who is this book for?

This book is for beginner to intermediate-level Julia programmers who want to enhance their skills in designing and developing large-scale applications.

What you will learn

  • Master the Julia language features that are key to developing large-scale software applications
  • Discover design patterns to improve overall application architecture and design
  • Develop reusable programs that are modular, extendable, performant, and easy to maintain
  • Weigh up the pros and cons of using different design patterns for use cases
  • Explore methods for transitioning from object-oriented programming to using equivalent or more advanced Julia techniques
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Length: 532 pages
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Table of Contents

18 Chapters
Section 1: Getting Started with Design Patterns Chevron down icon Chevron up icon
Design Patterns and Related Principles Chevron down icon Chevron up icon
Section 2: Julia Fundamentals Chevron down icon Chevron up icon
Modules, Packages, and Data Type Concepts Chevron down icon Chevron up icon
Designing Functions and Interfaces Chevron down icon Chevron up icon
Macros and Metaprogramming Techniques Chevron down icon Chevron up icon
Section 3: Implementing Design Patterns Chevron down icon Chevron up icon
Reusability Patterns Chevron down icon Chevron up icon
Performance Patterns Chevron down icon Chevron up icon
Maintainability Patterns Chevron down icon Chevron up icon
Robustness Patterns Chevron down icon Chevron up icon
Miscellaneous Patterns Chevron down icon Chevron up icon
Anti-Patterns Chevron down icon Chevron up icon
Traditional Object-Oriented Patterns Chevron down icon Chevron up icon
Section 4: Advanced Topics Chevron down icon Chevron up icon
Inheritance and Variance Chevron down icon Chevron up icon
Assessments Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

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B. G. Mar 13, 2020
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I've been programming Julia for 3-4 months now and like the language more every day.But, the paucity of up to date documentation on advanced language features can be frustrating. The information is either scattered across a million web pages or doesn't seem to exist anywhere. Until this book put it all in one place.I have purchased 4 or 5 other books on Julia but none have the depth and breadth of coverage of this one. This book is also more up to date, covering features in language version 1.3, the most recent release.The coverage of both basic and advanced topics is extensive. Every concept is clearly explained. I learn something new and useful on almost every page.If you are new to programming Think Julia is probably a better place to start, even though it is slightly out of date. But if you know how to program and want to unlock the power of Julia this is, by far, the best book available.
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Daniel Nov 10, 2020
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Très bien fait, réponds à mes attentes.
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Scott M. Mar 17, 2021
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I've been programming since Turbo Pascal in the early 80s and have deployed significant projects in maybe a dozen languages. I've read many dozens of programming books. What I'm trying to say is this isn't my first rodeo.This book is one of the best programming books I've ever read. The structure is easy to digest --- the sections are short, the points are clearly made, and many examples (that show both what works and what doesn't work) are provided. I had never read a technical book on a Kindle that actually was comfortable and usable. But the design worked very well.In addition to all of this, having the author go through the 23 GoF patterns and showing in detail how they can be handled in Julia was absolutely masterful.My only wish is that this book had an index. A minor nit to pick, but it would have been nice.This was my first book on Julia. I'm sure I will be learning more about this language through Udemy, online forums, and more. But I now feel that I understand why this language is so compelling and is a tool that I need in my toolbox. Thanks, Mr. Kwong!
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A. Loudenback Feb 27, 2020
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I have been really enjoying this book, after having used Julia for a couple of years this has solidified a lot of concepts for me and introduced me to new ones. The examples are relevant and simple, without feeling contrived. The book covers a lot of the unique/fundamental benefits of Julia (multiple dispatch, parametric types, meta-programming, performance) and helps you avoid pitfalls (such as over-crowding your global package space by using smart package management).
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Christian Jespersen Dec 04, 2022
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This book was much more beneficial than I expected. Increasing maintainability and extendability significantly.
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