TypeScript: JavaScript Development Guide

114 Pages·2016·0.48 MB·English

by  Nicholas Brown

TypeScript

JavaScript Development Guide

By Nicholas Brown

Copyright©2016 by Nicholas Brown
All Rights Reserved
Copyright © 2016 by David Johnson

All rights reserved. No part of this publication may be reproduced, distributed, or
transmitted in any form or by any means, including photocopying, recording, or other
electronic or mechanical methods, without the prior written permission of the author,
except in the case of brief quotations embodied in critical reviews and certain other
noncommercial uses permitted by copyright law.
Table of Contents
Introduction
Chapter 1- A Brief Overview of TypeScript
Chapter 2- Installing TypeScript
Chapter 3- Type Annotations
Chapter 4- Interfaces
Chapter 5- Arrow Function Expressions
Chapter 6- Classes
Chapter 7- Destructuring
Chapter 8- for…of
Chapter 9- Iterators
Chapter 10- Template Strings
Chapter 11- Spread Operator
Chapter 12- Enums
Chapter 13- let
Conclusion
Disclaimer

While all attempts have been made to verify the information provided in this book,
the author does assume any responsibility for errors, omissions, or contrary
interpretations of the subject matter contained within. The information provided in
this book is for educational and entertainment purposes only. The reader is responsible for
his or her own actions and the author does not accept any responsibilities for any liabilities
or damages, real or perceived, resulting from the use of this information.

The trademarks that are used are without any consent, and the publication of the
trademark is without permission or backing by the trademark owner. All
trademarks and brands within this book are for clarifying purposes only and are the
owned by the owners themselves, not affiliated with this document.
Introduction

There is a greater need for large software applications, and especially the web
applications. The reason behind this is the increase in the functionalities which are needed
to be implemented in software applications. This calls for us to learn how to develop large
applications. This can only be done in programming languages which are capable of
supporting that. TypeScript is one of such programming languages. It supports the creation
of large applications. This book is an excellent waay for you to learn how to program in
TypeScript. Enjoy reading!

Chapter 1- A Brief Overview of
TypeScript

TypeScript is a programming language which was developed and is maintained by
Microsoft. It is an open source programming language. The language is a superset of
JavaScript since it has added some extra features to it, such as support for object oriented
programming and optional static typing. The language was developed for the purpose of
creating large applications, and it always compiles into JavaScript. One can use
TypeScript to develop JavaScript applications for both the client side and server side.
Since we have said that TypeScript is a superset of javaScript, any program written in
JavaScript is also viable to be considered a TypeScript program. The TypeScript compiler
was also written in TypeScript.

The aim of TypeScript is to provide developers with an easy mechanism by which to
develop large applications. It comes with concepts such as classes, inheritance, interfaces,
modules, and others, and these make it easy for developers to create large applications
with much ease.

Chapter 2- Installing TypeScript

There are two ways that we can install TypeScript into our system. These include the
following:

1. By use of the npm (Node Package Manager) tool.

2. By installation of Visual studio plugins for TypeScript.

For Windows users, you can use the second option if it will be more convenient for you.
Just install the Visual Studio, and then download and install the necessary plugin for
programming in TypeScript. This option has been found to be a bit superior compared to
the use of other code editors.

For those using platforms other than Windows, just ensure that you have a text editor, a
browser, and the npm package for TypeScript so as to be able to program in TypeScript.