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.
Table of Contents (14 chapters)
1
Section 1: Getting Started with TypeScript 4
4
Section 2: Core Design Patterns and Concepts
8
Section 3: Advanced Concepts and Best Practices

OOP with TypeScript

TypeScript supports multiple programming paradigms. A programming paradigm is a way that a language supports and promotes language features such as immutability, abstractions, or function literals.

OOP is a programming paradigm where objects are first-class citizens. Objects are a concept that we use to describe things that contain data and ways to retrieve the data. Usually, you try to design objects that model the real world or a domain primitive. For example, if you are trying to model a real user into a type, then we create a User class containing the data that you want to capture for that user.

The four principles of OOP are encapsulation, abstraction, inheritance, and polymorphism. We'll start explaining those principles one by one.

Abstraction

Abstraction is a way of having implementation details hidden from the client or the user of an object. You can implement abstract entities to provide an interface of allowed operations and then we can...