Book Image

TypeScript 4 Design Patterns and Best Practices

By : Theofanis Despoudis
Book Image

TypeScript 4 Design Patterns and Best Practices

By: Theofanis Despoudis

Overview of this book

Design patterns are critical armor for every developer to build maintainable apps. TypeScript 4 Design Patterns and Best Practices is a one-stop guide to help you learn design patterns and practices to develop scalable TypeScript applications. It will also serve as handy documentation for future maintainers. This book takes a hands-on approach to help you get up and running with the implementation of TypeScript design patterns and associated methodologies for writing testable code. You'll start by exploring the practical aspects of TypeScript 4 and its new features. The book will then take you through the traditional gang of four (GOF) design patterns in their classic and alternative form and show you how to use them in real-world development projects. Once you've got to grips with traditional design patterns, you'll advance to learning about their functional programming and reactive programming counterparts and how to couple them to deliver better and more idiomatic TypeScript code. By the end of this TypeScript book, you'll be able to efficiently recognize when and how to use the right design patterns in any practical use case and gain the confidence to work on scalable and maintainable TypeScript projects of any size.

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Table of Contents (14 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Download the example code files
Download the color images
Conventions used
Get in touch
Share your thoughts
1
Section 1: Getting Started with TypeScript 4
Section 1: Getting Started with TypeScript 4
Free Chapter
2
Chapter 1: Getting Started with Typescript 4
Chapter 1: Getting Started with Typescript 4
Technical requirements
Introducing TypeScript 4
Understanding TypeScript and JavaScript's relationship
Installing and using the code examples
Using VSCode with TypeScript
Introducing Unified Modeling Language (UML)
Summary
Q & A
Further reading
3
Chapter 2: TypeScript Core Principles
Chapter 2: TypeScript Core Principles
Technical requirements
Working with advanced types
OOP with TypeScript
Developing in the browser
Developing in the server
Introducing design patterns in TypeScript
Summary
Q&A
Further reading
4
Section 2: Core Design Patterns and Concepts
Section 2: Core Design Patterns and Concepts
5
Chapter 3: Creational Design Patterns
Chapter 3: Creational Design Patterns
Technical requirements
Creational design patterns
Singleton pattern
Prototype pattern
Builder pattern
Factory method pattern
Abstract Factory pattern
Summary
Q&A
Further reading
6
Chapter 4: Structural Design Patterns
Chapter 4: Structural Design Patterns
Technical requirements
Understanding structural design patterns
Adapter pattern
Decorator pattern
Façade pattern
Composite pattern
Proxy pattern
Bridge pattern
Flyweight pattern
Summary
Q&A
Further reading
7
Chapter 5: Behavioral Design Patterns
Chapter 5: Behavioral Design Patterns
Technical requirements
Behavioral design patterns
The Strategy pattern?
Chain of Responsibility
The Command pattern
The Iterator pattern
The Mediator pattern
The Observer pattern
The Memento pattern
The State pattern
The Template method pattern
The Visitor pattern
Summary
Q&A
Further reading
8
Section 3: Advanced Concepts and Best Practices
Section 3: Advanced Concepts and Best Practices
9
Chapter 6: Functional Programming with TypeScript
Chapter 6: Functional Programming with TypeScript
Technical requirements
Learning key concepts in functional programming
Understanding functional lenses
Understanding transducers
Understanding monads
Summary
Q & A
Further reading
10
Chapter 7: Reactive Programming with TypeScript
Chapter 7: Reactive Programming with TypeScript
Technical requirements
Learning Reactive programming concepts
The asynchronous propagation of changes
Understanding Promises and Futures
Learning observables
Summary
Q & A
Further reading
11
Chapter 8: Developing Modern and Robust TypeScript Applications
Chapter 8: Developing Modern and Robust TypeScript Applications
Technical requirements
Combining patterns
Using utility types
Using domain-driven design
Applying the SOLID principles
Summary
Q&A
Further reading
12
Chapter 9: Anti-Patterns and Workarounds
Chapter 9: Anti-Patterns and Workarounds
Technical requirements
Class overuse
Not using runtime assertions
Permissive or incorrect types
Using idiomatic code from other languages
Type inference gotchas
Summary
Q & A
Further reading
Why subscribe?
13
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Q&A

  1. How is Mediator different compared to the Observer pattern?

    Both patterns work in a similar manner; however, their goals are marginally different. The goal of the Mediator is to eliminate direct communication between system components. With a Mediator, you usually know the dependent structures and perform calls based on the events that it receives. With Observer, you are slightly more loosely coupled as the publisher does not identify the details of the subscriber list. Some subscribers might choose to ignore certain messages, and some may choose to respond to them.

  2. How is the Chain of Responsibility different compared to the Decorator pattern?  

    The Decorator pattern usually extends one object's behavior and does not try to block the flow of requests. With a Chain of Responsibility, you are allowed to break the flow under certain criteria.

  3. How is Visitor different compared to the Composite pattern?

    The Visitor pattern works together with the Composite...

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