Book Image

Mastering TypeScript 3 - Third Edition

By : Nathan Rozentals
Book Image

Mastering TypeScript 3 - Third Edition

By: Nathan Rozentals

Overview of this book

TypeScript is both a language and a set of tools to generate JavaScript. It was designed by Anders Hejlsberg at Microsoft to help developers write enterprise-scale JavaScript. Starting with an introduction to the TypeScript language, before moving on to basic concepts, each section builds on previous knowledge in an incremental and easy-to-understand way. Advanced and powerful language features are all covered, including asynchronous programming techniques, decorators, and generics. This book explores many modern JavaScript and TypeScript frameworks side by side in order for the reader to learn their respective strengths and weaknesses. It will also thoroughly explore unit and integration testing for each framework. Best-of-breed applications utilize well-known design patterns in order to be scalable, maintainable, and testable. This book explores some of these object-oriented techniques and patterns, and shows real-world implementations. By the end of the book, you will have built a comprehensive, end-to-end web application to show how TypeScript language features, design patterns, and industry best practices can be brought together in a real-world scenario.
Table of Contents (16 chapters)
Free Chapter
TypeScript Tools and Framework Options

Decorators, Generics, and Asynchronous Features

Above and beyond the concepts of classes, interfaces, and inheritance, the TypeScript language introduces a number of advanced language features in order to aid the development of robust object-oriented code. These features include decorators, generics, promises, and the use of the async and await keywords when working with asynchronous functions. Decorators allow for the injection and querying of metadata when working with class definitions, as well as the ability to programmatically attach to the act of defining a class. Generics provide a technique for writing routines where the exact type of an object used is not known until runtime. Promises provide the ability to write asynchronous code in a fluent manner, and async await functions will pause execution until an asynchronous function has completed.

When writing large-scale JavaScript...