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From the Publisher
From the Preface
Who Should Read This Book
If you have an understanding of writing JavaScript code, can run basic commands in a terminal, and are interested in learning about TypeScript, this book is for you.
Maybe you’ve heard TypeScript can help you write a lot of JavaScript with fewer bugs (true!) or document your code well for other people to read (also true!). Maybe you’ve seen TypeScript show up in a lot of job postings, or in a new role you’re starting.
Whatever your reason, as long as you come in knowing the fundamentals of JavaScript—variables, functions, closures/scope, and classes—this book will take you from no TypeScript knowledge to mastering the fundamentals and most important features of the language.
By the end of this book, you will understand:
- The history and context for why TypeScript is useful on top of “vanilla” JavaScript
- How a type system models code
- How a type checker analyzes code
- How to use development-only type annotations to inform the type system
- How TypeScript works with IDEs (Integrated Development Environments) to provide code exploration and refactoring tools
And you will be able to:
- Articulate the benefits of TypeScript and general characteristics of its type system.
- Add type annotations where useful in your code.
- Represent moderately complex types using TypeScript’s built-in inferences and new syntax.
TypeScript is a wildly popular language in both industry and open source:
- GitHub’s 2021 and 2020 State of the Octoverses have it at the platform’s fourth top language
- StackOverflow’s 2021 Developer Survey has it at the world’s third most loved language
- The 2020 State of JS Survey shows TypeScript has consistently high satisfaction and usage amounts
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