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)

Asynchronous programming using TypeScript

Asynchronous programming is one of those concepts which are little tricky to understand but mandatory to know if you are building a responsive application. JavaScript is a single-threaded application so if we do all our work on that thread, then any time we have a task that is time-consuming, such as a web service call, we will end up making our user wait until the application returns back from the call.

To be able to manage these expensive tasks we have asynchronous programming. As you would imagine TypeScript makes it easier for us to write and manage asynchronous code. Today, there are multiple ways to write efficient, asynchronous code with each new version of JavaScript. TypeScript supports all these approaches and we will go through them here to better understand the asynchronous programming.

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