Book Image

Advanced TypeScript Programming Projects

By : Peter O'Hanlon
Book Image

Advanced TypeScript Programming Projects

By: Peter O'Hanlon

Overview of this book

With the demand for ever more complex websites, the need to write robust, standard-compliant JavaScript has never been greater. TypeScript is modern JavaScript with the support of a first-class type system, which makes it simpler to write complex web systems. With this book, you’ll explore core concepts and learn by building a series of websites and TypeScript apps. You’ll start with an introduction to TypeScript features that are often overlooked in other books, before moving on to creating a simple markdown parser. You’ll then explore React and get up to speed with creating a client-side contacts manager. Next, the book will help you discover the Angular framework and use the MEAN stack to create a photo gallery. Later sections will assist you in creating a GraphQL Angular Todo app and then writing a Socket.IO chatroom. The book will also lead you through developing your final Angular project which is a mapping app. As you progress, you’ll gain insights into React with Docker and microservices. You’ll even focus on how to build an image classification program with machine learning using TensorFlow. Finally, you’ll learn to combine TypeScript and C# to create an ASP.NET Core-based music library app. By the end of this book, you’ll be able to confidently use TypeScript 3.0 and different JavaScript frameworks to build high-quality apps.
Table of Contents (13 chapters)

Long-running client/server communications using Socket.IO

So far, we have covered a variety of ways of communicating back and forth between a client and a server, but they have all had one thing in common—they were reacting to some form of interaction to trigger the transfer of data. Irrespective of whether we clicked a link or pushed a button, there was some user input that triggered that back and forth between the two sides.

There are some situations, however, where we would like to keep the lines of communication between the client and the server open permanently so that data can be pushed as soon as it's available. If we were playing an online game, for instance, we wouldn't want to have to push a button just to get other players' statuses updated on our screen. What we need is a technology that maintains the connection for us and allows us to pass messages...