About The Book
First, the book gently explores TypeScript, from basic ideas to common techniques and advanced strategies. Then, right around the midpoint, we’ll take the leap into structural type systems and why they are so useful for your work.
We’ll dive into working with types, typing functions, union and intersection types, generics, conditional types and wrap up with thinking in types.
— Natalie Marleny, Application Engineer
- Core concepts of TypeScript, and why they matter.
- How to use TypeScript in your current projects,
- TypeScript code walkthroughs, applicable right away.
- TypeScript tooling, needed to use it effectively.
- How to get most out of TypeScript without learning a new language.
- Structural type systems and their semantics.
- Low-maintenance types and how to evolve them.
- How to bend the type system to make it fit your needs.
- Check the PDF preview (3MB) and get the book right away.
A look inside the book: with 464 pages on everything TypeScript. Photo: Marc Thiele. Large view.
Who is this book for?
If you ever find yourself:
then TypeScript will do right by you.
Table Of Contents
Programming books have a tendency to become outdated very quickly. When Stefan set out to
write this book, his most important goal was that it had to be timeless. TypeScript gets at least two major releases
a year, so there are new features and changes coming regularly.
That’s why the book focuses on the long-lasting aspects of the
type system. You’ll understand how TypeScript works, and how to apply new features long after you’ve turned the last page of this book.
The book is split into 7 chapters.
In this chapter, we want to debunk myths. TypeScript can be so many things, and many people have different views on this programming language that has become so popular in recent years. What is TypeScript actually about? Let’s see what TypeScript has in store for us.
We go on a hunt for red squiggly lines. If a word processor can highlight our spelling and grammar mistakes, why shouldn’t a programming editor do the same? We will see that – given the right tools – we might already be using TypeScript without realizing. With TypeScript being a gradual type system, we can gently encourage the programming language to give us more insights into our code. We will also write our first types.
We learn about some major features of TypeScript, like type annotations, type inference, and control flow. We will define primitive and complex types, and learn about the difference between types and interfaces. For every variable or constant we can create, we find a way to provide a type.
We learn about function heads and bodies, structural typing for functions, and how we can define different behavior for the same function.
TypeScript’s type system can be seen as an endless space of values, and types are nothing but discrete sets of values inside this space. This allows for algebraic operations like union and intersections, making it a lot easier for us to define concrete types for values. We learn about type widening and narrowing, top and bottom types, and how we can influence control flow.
Generics are a way to prepare types for the unknown. Whenever we know a certain behavior of a type but can’t exactly say which type it affects, a generic helps us to model this behavior. We learn about generic constraints, binding generics, mapped types, and type modifiers.
Conditional types allow us to introduce a level of meta-programming unseen in programming languages, where we can create if/else clauses to determine a type based on the input type. This allows for a powerful set of tools we can use to define model and behavior once, and make sure we don’t end up in type maintenance hell.
We’ll get into a thinking-in-types mindset, where we take care about a robust and well-defined set of types before starting implementation. This helps us validate that what we code is what we expect.
“Stefan Baumgartner’s book finally made me want to use TypeScript. Until now, I didn’t understand why I should use TypeScript. Without knowing the core principles, it made things more complicated for me. After reading this book, I know how to use the power of TypeScript to my advantage.”
— Vanessa Böhner, Software Developer and Chapter Leader at Front-End Foxes
“Stefan walks you through everything from basic types to advanced concepts like the
inferkeyword in a clear and easy to understand way. The book is packed with many real world examples and great tips, transforming you into a TypeScript expert by the end of it. Highly recommended read!”
— Marvin Hagemeister, Creator of Preact-Devtools
464 pages. The eBook is available (PDF, ePUB, Amazon Kindle). Shipping now. Written by Stefan Baumgartner. Designed by Rob Draper.
About the Author
Stefan Baumgartner is a software architect based in Austria. He has published online since the late 1990s, writing for Manning, Smashing Magazine, and A List Apart. He organizes ScriptConf, TSConf:EU, and DevOne in Linz, and co-hosts the German-language Working Draft podcast.
- ISBN: 978-3-945749-90-6 (print)
- Quality hardcover, stitched binding, ribbon page marker.
- Free worldwide airmail shipping from Germany. (Check your delivery times). Due to Covid-19 and import restrictions, there could be some delays. But you can start reading the eBook right away.
- eBook is available as PDF, ePUB, and Amazon Kindle.
- Get the book right away.
Code Snippets and Hands-On Examples
TypeScript in 50 Lessons is a very practical book. It features lots of examples that not only give you an idea about syntax and semantics, but show you actual use-cases that you might encounter in your applications.
To help you follow the code examples in the book, Stefan has set up projects on Code Sandbox and the TypeScript playground, where you can fiddle around on your own and see how the TypeScript’s type system behaves. You’ll find all code snippets on the TypeScript book website.
We take time to carefully craft, edit and print our printed books. This one in no exception. Not just a wonderful book to learn from, but also a beautiful book that looks lovely on a kitchen table. The cover and the chapter illustrations designed with love by Rob Draper. Photos taken by a good friend of ours, Marc Thiele.
Community Matters ❤️
Producing a book takes quite a bit of time, and we couldn’t pull it off without the support of our wonderful community. A huge shout-out to Smashing Members for their ongoing support in our adventures. As a result, the eBook is and always will be free for Smashing Members. Plus, Members get a friendly discount when purchasing their printed copy.
Stay smashing, and thank you for your ongoing support, everyone!
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