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)

Chapter 3

  1. React provides us with special file types, .jsx (for JavaScript) or .tsx (for TypeScript), to create a file that can be transpiled down to JavaScript, so React takes the elements that look like HTML and renders them as JavaScript instead.
  2. Both class and for are reserved keywords in JavaScript. Since .tsx files seemingly mix JavaScript and HTML together inside the same method, we need aliases to specify the CSS class and the control a label is associated with. React provides className to specify the class that should be applied to an HTML element and htmlFor to specify what control the label is associated with.
  3. When we created our validators, we were creating reusable pieces of code that could be used to actually perform specific types of validation; for example, checking to ensure that a string was a minimum length. Since these were designed to be reusable, we had to...