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- Herausgeber: Packt Publishing
- Kategorie: Wissenschaft und neue Technologien
- Sprache: Englisch
Build exciting end-to-end applications with TypeScript
About This Book
- This book will help you whether you're a beginner or an expert
- Complete and complex projects provide codes that are ready and solutions for start-ups and enterprise developers
- The book will showcase the power and depth of TypeScript when it comes to high performance and scalability
Who This Book Is For
This book was written for web developers who wish to make the most of TypeScript and build fun projects. You should be familiar with the fundamentals of JavaScript
What You Will Learn
- Build quirky and fun projects from scratch while exploring widely applicable practices and techniques
- Use TypeScript with a range of different technologies such as Angular 2 and React and write cross-platform applications
- Migrate JavaScript codebases to TypeScript to improve your workflow
- Write maintainable and reusable code that is helpful in the world of programming revolving around features and bugs
- Using System.JS and Webpack to load scripts and their dependencies.
- Developing highly performance server-side applications to run within Node Js.
- Reviewing high performant Node.js patterns and manage garbage collection.
In Detail
TypeScript is the future of JavaScript. Having been designed for the development of large applications, it is being widely incorporated in popular projects such as Angular JS 2.0. Adopting TypeScript results in more robust software, while still being deployable in apps where regular JavaScript would run.
Scale and performance lie at the heart of the projects built in our book. The lessons learned throughout this book will arm you with everything you need to build amazing projects. During the course of this book, you will learn how to build a complete Single Page Application with Angular 2 and create a popular mobile app using NativeScript.
Further on, you will build a classic Pac Man game in TypeScript. We will also help you migrate your legacy codebase project from JavaScript to TypeScript.
By the end of the book, you will have created a number of exciting projects and will be competent using TypeScript for your live projects.
Style and approach
The book focuses on building projects from scratch. These end-to-end projects will give you ready-to-implement solutions for your business scenario, showcasing the depth and robustness of TypeScript.
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Seitenzahl: 296
Veröffentlichungsjahr: 2016
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Table of Contents
TypeScript Blueprints
TypeScript Blueprints
Copyright © 2016 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First published: July 2016
Production reference: 1250716
Published by Packt Publishing Ltd.
Livery Place
35 Livery Street
Birmingham
B3 2PB, UK.
ISBN 978-1-78588-701-7
www.packtpub.com
Credits
Authors
Ivo Gabe de Wolff
Copy Editor
Safis Editing
Reviewer
Matthew Hill
Project Coordinator
Ulhas Kambali
Commissioning Editor
Kunal Parikh
Proofreader
Safis Editing
Acquisition Editor
Divya Poojari
Indexer
Rekha Nair
Content Development Editor
Prashanth G
Graphics
Jason Monteiro
Technical Editor
Shivani K. Mistry
Production Coordinator
Aparna Bhagat
About the Author
Ivo Gabe de Wolff has been a freelance developer under the name of ivogabe since 2012 and he is studying mathematics and computing sciences at Utrecht University. When he was eleven he started programming in Game Maker. Currently, he uses TypeScript on a daily basis. Recently, he has used TypeScript in lots of different environments, including mobile apps, servers, and command-line tools. Now he mainly specializes in NodeJS programming.
Furthermore, he is the author of various open source projects, including gulp-typescript. You can find his projects on github.com/ivogabe. If you want to read more about TypeScript, JavaScript, gulp, or Functional Programming, you can take a look at his blog at dev.ivogabe.com.
It required a lot of work to compose this book. I could not have done this without the help of these people:
The team at Packt Publishing and the reviewers of this book, because of their precise feedback and hard work. This has helped me a lot to improve the quality of this book.
My fellow students, for brainstorming and helping on specific topics.
My teachers at Utrecht University, for giving inspiration and challenging me on various topics. I especially want to thank Jurriaan Hage for supervising my thesis.
Finally, my family, for their support and tips, even though they did not have knowledge on these topics. These people have helped me to to make the book as it now lies in front of you.
About the Reviewer
Matthew Hill is a British software developer with substantial experience in web application development. An established developer in the TypeScript and JavaScript spheres, he thoroughly enjoys working on open source projects and dipping into often esoteric technologies. Outside of programming, Matthew has a fervent interest in literature.
After graduating with a computer science degree, he started his career at Sky UK Ltd, where he developed video streaming applications, subsequently moving on to engineer single-page analytics applications at payments startup Velocity. Now he’s working at financial services leader Tradeweb, fleshing out their next-generation JavaScript-based trading platform.
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Preface
TypeScript allows developers to write readable and maintainable web applications. Editors can provide several tools to the developer, based on types and static analysis of the code. In this book, you will learn how you can use TypeScript to build clean web applications. You will learn how to use Angular 2 and React.
You will also learn how you can use TypeScript for servers, mobile apps, command-line tools, and games. We will build various servers, write a mobile app, rewrite Pac Man, and build Tic-Tac-Toe as a command-line application. You will also learn functional programming. This style of programming will improve your general code skills. You will see how this style can be used in TypeScript.
What this book covers
The book can be divided in two sections. The first section, chapters 1 to 4, describe how you can build standard application. These chapters introduce Angular 2 and React for web applications, NodeJS for servers and NativeScript for mobile apps. You should read chapters 1 to 3 in a sequence.
The second section, chapters 5 to 8, introduce more complex concepts. You will learn functional programming in chapters 5 to 7. The last chapter contains guidance to migrate a JavaScript codebase to TypeScript. You can read chapters 5 to 7 when you have not read chapters 1 to 4, though chapter 5 requires some knowledge of React.
Chapter 1, TypeScript 2.0 Fundamentals, will explain core principals to create (web) applications with TypeScript. If you have some basic knowledge of TypeScript 2.0 then you can skim over this chapter or use it as a reference while reading the other chapters. If you have not used TypeScript yet, then this chapter will teach you the fundamentals of TypeScript 2.0
Chapter 2, A Weather Forecast Widget with Angular 2, you will learn how you can build an application in Angular 2. The chapter introduces core principals of Angular and will use an online API as source for the weather forecast.
Chapter 3, Note-Taking App with a Server, we will build a server and client with Node and Angular for this application. You will see how code can be shared between the client and the server.
Chapter 4, Real-Time Chat, introduces React and websockets. Using these techniques, we will write the server and client of the chat application.
Chapter 5, Native QR Scanner App, after having written three web applications, we will now write a mobile app. You will learn how you can use NativeScript and its plugins to write a native app.
Chapter 6, Advanced Programming in TypeScript, covers more advanced features of TypeScript, including type guards, control flow analysis and performance of algorithms.
Chapter 7, Spreadsheet Applications with Functional Programming, introduces a different programming style: functional programming. You will learn how this can be used in TypeScript. We will use React with a Flux-based architecture, which fits nicely with TypeScript and Functional Programming.
Chapter 8, Pac Man in HTML5, will show how to use the HTML5 canvas to create a game. We will use some Functional Programming again, and take a look at how we can create a framework for it based on the Flux architecture.
Chapter 9, Playing Tic-Tac-Toe against an AI, will explain how to build a command-line application in which you can play Tic-Tac-Toe. You will learn how you can learn the computer to play the game. When done correctly, the computer should never lose.
Chapter 10, Migrate JavaScript to TypeScript, will show how you can incrementally migrate a JavaScript codebase to TypeScript. We will focus on how you can keep the project working during this transition.
What you need for this book
You will need an editor to write the code, a terminal to compile the code, and a browser to see the results. Visual Studio Code and Atom with atom-typescript are good editors in which you can write TypeScript code. These are available for Windows, Mac, and Linux. You have to compile TypeScript in a terminal. On Windows, you can use the Command Prompt or Powershell for that. On a Mac, you can use Terminal.
To compile TypeScript, you need NodeJS. You can find details on how you can install it in the first chapter.
Chapter 5, Native QR Scanner App, has more requirements to run the mobile app in an emulator or a device. Details about how you can install these dependencies are found in the chapter.
Who this book is for
If you are interested in building fun projects using TypeScript, then this book is for you. This book will appeal to web developers who wish to make the most of TypeScript. You should be familiar with the fundamentals of JavaScript.
Conventions
In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.
Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "We can include other contexts through the use of the include directive."
A block of code is set as follows:
export function factorial(x: number): number { if (x <= 1) return 1; return x * factorial(x - 1); }When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:
export function factorial(x: number): number { if (x <= 1) return 1; return x * factorial(x - 1); }Any command-line input or output is written as follows:
npm init -yNew terms and important words are shown in bold.
Note
Warnings or important notes appear in a box like this.
Tip
Tips and tricks appear like this.
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Errata
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Questions
If you have a problem with any aspect of this book, you can contact us at [email protected], and we will do our best to address the problem.
Chapter 1. TypeScript 2.0 Fundamentals
In Chapters 2 through 5, we will learn a few frameworks to create (web) applications with TypeScript. First you need some basic knowledge of TypeScript 2.0. If you have used TypeScript previously, then you can skim over this chapter, or use it as a reference while reading the other chapters. If you have not used TypeScript yet, then this chapter will teach you the fundamentals of TypeScript.
What is TypeScript?
The TypeScript language looks like JavaScript; it is JavaScript with type annotations added to it. The TypeScript compiler has two main features: it is a transpiler and a type checker. A transpiler is a special form of compiler that outputs source code. In case of the TypeScript compiler, TypeScript source code is compiled to JavaScript code. A type checker searches for contradictions in your code. For instance, if you assign a string to a variable, and then use it as a number, you will get a type error.
The compiler can figure out some types without type annotations; for others you have to add type annotations. An additional advantage of these types is that they can also be used in editors. An editor can provide completions and refactoring based on the type information. Editors such as Visual Studio Code and Atom (with a plugin, namely atom-typescript) provide such features.
