Book Image

TypeScript 2.x By Example

By : Sachin Ohri
Book Image

TypeScript 2.x By Example

By: Sachin Ohri

Overview of this book

The TypeScript language, compiler, and open source development toolset brings JavaScript development up to the enterprise level. It allows you to use ES5, ES6, and ES7 JavaScript language features today, including classes, interfaces, generics, modules, and more. Its simple typing syntax enables building large, robust applications using object-oriented techniques and industry-standard design principles. This book aims at teaching you how to get up and running with TypeScript development in the most practical way possible. Taking you through two exciting projects built from scratch, you will learn the basics of TypeScript, before progressing to functions, generics, promises, and callbacks. Then, you’ll get to implement object-oriented programming as well as optimize your applications with effective memory management. You’ll also learn to test and secure your applications, before deploying them. Starting with a basic SPA built using Angular, you will progress on to building, maybe, a Chat application or a cool application. You’ll also learn how to use NativeScript to build a cool mobile application. Each of these applications with be explained in detail, allowing you to grasp the concepts fast. By the end of this book, you will have not only built two amazing projects but you will also have the skills necessary to take your development to the next level.
Table of Contents (11 chapters)

Classes in TypeScript

Classes have been some of the most sought-after features of TypeScript. Classes and interfaces are the cornerstones of writing object-oriented code. Object-oriented programming provides the following features:

  • Inheritance
  • Polymorphism
  • Encapsulation
  • Abstraction

In this section, we will look at classes in TypeScript and see how we can write code in an object-oriented fashion. We will start by looking at what classes are and how they are defined in TypeScript. Then, we will look at a special keyword called constructor, which is used to initialize the properties of a class. From there, we will look at how we can write and access the properties and methods of a class. To cement our understanding of classes, we will create an example of a class and see all the features in it.

Classes in TypeScript have additional features, such as declaring static properties...