Book Image

Learn TypeScript 3 by Building Web Applications

By : Sebastien Dubois, Alexis Georges
Book Image

Learn TypeScript 3 by Building Web Applications

By: Sebastien Dubois, Alexis Georges

Overview of this book

TypeScript is a superset of the JavaScript programming language, giving developers a tool to help them write faster, cleaner JavaScript. With the help of its powerful static type system and other powerful tools and techniques it allows developers to write modern JavaScript applications. This book is a practical guide to learn the TypeScript programming language. It covers from the very basics to the more advanced concepts, while explaining many design patterns, techniques, frameworks, libraries and tools along the way. You will also learn a ton about modern web frameworks like Angular, Vue.js and React, and you will build cool web applications using those. This book also covers modern front-end development tooling such as Node.js, npm, yarn, Webpack, Parcel, Jest, and many others. Throughout the book, you will also discover and make use of the most recent additions of the language introduced by TypeScript 3 such as new types enforcing explicit checks, flexible and scalable ways of project structuring, and many more breaking changes. By the end of this book, you will be ready to use TypeScript in your own projects and will also have a concrete view of the current frontend software development landscape.
Table of Contents (15 chapters)

Generics

There are numerous ways to make your code more extensible, maintainable, and, most importantly, reusable. One such way, which we will discuss now, is through the usage of generic, or parameterized, types. Simply put, as their name suggests, they allow you to write more generic code. Generic code is great because it can help you to avoid duplication and increase reusability.

Generics allow you to write code that works with a variety of types instead of just a single type. They allow you to abstract over types by enabling classes, types, and interfaces to act as parameters. In practice, using generics means that you can pass different types as parameters, making your types and functions more open and reusable.

Generics are supported in many languages such as C++, Java, C#, and Haskell. And, last but not least, TypeScript, of course, also supports generics! This is great...