Cherny - Programming TypeScript: making your JavaScript applications scale
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- Book:Programming TypeScript: making your JavaScript applications scale
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This is the right book to help you learn TypeScript in depth. Programming TypeScript shows all the benefits of using a type system on top of JavaScript and provides deep insight into how to master the language.
Minko Gechev, Engineer, Angular Team at Google
Programming TypeScript onboarded me to the TypeScript tooling and overall ecosystem quickly and efficiently. Every usage question I had was covered by concise, real-world examples. The Advanced Types chapter breaks down terminology I usually stumble over, and shows how to leverage TypeScript to create extremely safe code thats still pleasant to use.
Sean Grove, Cofounder of OneGraph
Boris has provided a comprehensive guide to TypeScript. Read this for the 10,000-foot view all the way back down to Earth, and then some.
Blake Embrey, Engineer at Opendoor, author of TypeScript Node and Typings
by Boris Cherny
Copyright 2019 Boris Cherny. All rights reserved.
Printed in the United States of America.
Published by OReilly Media, Inc. , 1005 Gravenstein Highway North, Sebastopol, CA 95472.
OReilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (http://oreilly.com). For more information, contact our corporate/institutional sales department: 800-998-9938 or corporate@oreilly.com .
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- May 2019: First Edition
- 2019-04-18: First Release
See http://oreilly.com/catalog/errata.csp?isbn=9781492037651 for release details.
The OReilly logo is a registered trademark of OReilly Media, Inc. Programming TypeScript, the cover image, and related trade dress are trademarks of OReilly Media, Inc.
The views expressed in this work are those of the author, and do not represent the publishers views. While the publisher and the author have used good faith efforts to ensure that the information and instructions contained in this work are accurate, the publisher and the author disclaim all responsibility for errors or omissions, including without limitation responsibility for damages resulting from the use of or reliance on this work. Use of the information and instructions contained in this work is at your own risk. If any code samples or other technology this work contains or describes is subject to open source licenses or the intellectual property rights of others, it is your responsibility to ensure that your use thereof complies with such licenses and/or rights.
978-1-492-03765-1
[LSI]
To Sasha and Michael, who might also fall in love with types, someday.
This is a book for programmers of all walks: professional JavaScript engineers, C# people, Java sympathizers, Python lovers, Ruby aficionados, Haskell nerds. Whatever language(s) you write in, so long as you have some experience programming and know the basics of functions, variables, classes, and errors, this book is for you. Some experience with JavaScript, including a basic knowledge of the Document Object Model (DOM) and the network, will help you along the waywhile we dont dive deep into these concepts, they are a wellspring of excellent examples, and if youre not familiar with them the examples might not make as much sense.
Regardless of what programming languages youve used in the past, what unites all of us is our shared experience of tracking down exceptions, tracing through code line by line to figure out what went wrong and how we can fix it. This is the experience that TypeScript helps prevent by examining your code automatically and pointing out the mistakes you may have missed.
Its OK if you havent worked with a statically typed language before. Ill teach you about types and how to use them effectively to make your programs crash less, document your code better, and scale your applications across more users, engineers, and servers. Ill try to avoid big words when I can, and explain ideas in a way thats intuitive, memorable, and practical, using lots of examples along the way to help keep things concrete.
Thats the thing about TypeScript: unlike a lot of other typed languages, TypeScript is intensely practical. It invents completely new concepts so you can speak more concisely and precisely, letting you write applications in a way thats fun, modern, and safe.
This book has two aims: to give you a deep understanding of how the TypeScript language works (theory) and provide bucketfuls of pragmatic advice about how to write production TypeScript code (practice).
Because TypeScript is such a practical language, theory quickly turns to practice, and most of this book ends up being a mix of the two, with the first couple of chapters almost entirely theory, and the last few almost completely practice.
Ill start with the basics of what compilers, typecheckers, and types are. Ill then give a broad overview of the different types and type operators in TypeScript, what theyre for, and how you use them. Using what weve learned, Ill cover some advanced topics like TypeScripts most sophisticated type system features, error handling, and asynchronous programming. Finally, Ill wrap up with how to use TypeScript with your favorite frameworks (frontend and backend), migrating your existing JavaScript project to TypeScript, and running your TypeScript application in production.
Most chapters come with a set of exercises at the end. Try to do these yourselftheyll give you a deeper intuition for what we cover than just reading would. Answers for chapter exercises are available online, at https://github.com/bcherny/programming-typescript-answers.
Throughout this book, I tried to stick to a single code style. Some aspects of this style are deeply personalfor example:
I only use semicolons when necessary.
I indent with two spaces.
I use short variable names like
a,f, or _ where the program is a quick snippet, or where the structure of the program is more important than the details.
Some aspects of the code style, however, are things that I think you should do too. A few of these are:
You should use the latest JavaScript syntax and features (the latest JavaScript version is usually just called esnext). This will keep your code in line with the latest standards, improving interoperability and Googleability, and it can help reduce ramp-up time for new hires. It also lets you take advantage of powerful, modern JavaScript features like arrow functions, promises, and generators.
You should keep your data structures immutable with spreads (
...) most of the time.You should make sure everything has a type, inferred when possible. Be careful not to abuse explicit types; this will help keep your code clear and terse, and improve safety by surfacing incorrect types rather than bandaiding over them.
You should keep your code reusable and generic. Polymorphism (see ) is your best friend.
Of course, these ideas are hardly new. But TypeScript works especially well when you stick to them. TypeScripts built-in downlevel compiler, support for read-only types, powerful type inference, deep support for polymorphism, and completely structural type system encourage good coding style, while the language remains incredibly expressive and true to the underlying JavaScript.
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