Chapter 1, An Introduction to Apex Design Pattern, covers the basics of inheritance, abstract classes, polymorphism, cohesion and coupling, and object-oriented design principles.

Chapter 2, Creational Patterns, focuses on different ways to instantiate objects to achieve code reusability, ease of maintenance, and loose coupling.

Chapter 3, Structural Patterns, explains the design patterns that can solve many situations and problems, which occur during project development in Apex, that demand a change in functionalities and cause a ripple effect on the rest of the system.

Chapter 4, Behavioral Patterns, provides a glimpse of some problems, such as double dispatch and code maintenance issues, and explains how to use appropriate design patterns to fix them.

Chapter 5, Handling Concurrency in Apex, discusses the design solution for the race condition in concurrency, which can result in data corruption without anyone noticing it.

Chapter 6, Anti-patterns and Best Practices, shows some common pitfalls observed during application development in Apex and suggested solutions.

We need an Internet-enabled computer that is capable of running modern browsers supported by Salesforce. We can use the developer console in a browser to write the Apex code in Salesforce.

Interested readers can also use their favorite IDEs, such as Sublime Text, Eclipse, Welkins, Atom, Aside, Cloud9, or BrainEngine.

You will also need a free Salesforce developer account to try all the code snippets and examples provided in this book.

This book is intended for all Apex developers who want to learn and enhance their Apex code designing skills by applying various design patterns. It can be considered as a stepping stone for beginners or intermediate-level Apex programmers by filling their arsenal with powerful design patterns.

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "The AdminGoldSupportImpl and AdminPlatinumSupportImpl classes are written in the same way."

A block of code is set as follows:

public class Mario {
    public void ability(){
        System.debug('I can Walk');
    }
    public void info(){
        System.debug('I am Mario');
    }
}

Any command-line input or output is written as follows:

$ mkdir css

$ cd css

New terms and important words are shown in bold. 

For this book we have outlined the shortcuts for the Mac OX platform if you are using the Windows version you can find the relevant shortcuts on the WebStorm help page https://www.jetbrains.com/webstorm/help/keyboard-shortcuts-by-category.html.

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To send us general feedback, simply e-mail <[email protected]>, and mention the book's title in the subject of your message.

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Now that you are the proud owner of a Packt book, we have a number of things to help you to get the most from your purchase.