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The TypeScript Workshop

The TypeScript Workshop

By : Ben Grynhaus , Jordan Hudgens , Rayon Hunte , Matt Morgan , Wekoslav Stefanovski
4.7 (19)
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The TypeScript Workshop

The TypeScript Workshop

4.7 (19)
By: Ben Grynhaus , Jordan Hudgens , Rayon Hunte , Matt Morgan , Wekoslav Stefanovski

Overview of this book

By learning TypeScript, you can start writing cleaner, more readable code that’s easier to understand and less likely to contain bugs. What’s not to like? It’s certainly an appealing prospect, but learning a new language can be challenging, and it’s not always easy to know where to begin. This book is the perfect place to start. It provides the ideal platform for JavaScript programmers to practice writing eloquent, productive TypeScript code. Unlike many theory-heavy books, The TypeScript Workshop balances clear explanations with opportunities for hands-on practice. You’ll quickly be up and running building functional websites, without having to wade through pages and pages of history and dull, dry fluff. Guided exercises clearly demonstrate how key concepts are used in the real world, and each chapter is rounded off with an activity that challenges you to apply your new knowledge in the context of a realistic scenario. Whether you’re a hobbyist eager to get cracking on your next project, or a professional developer looking to unlock your next promotion, pick up a copy and make a start! Whatever your motivation, by the end of this book, you’ll have the confidence and understanding to make it happen with TypeScript.
Table of Contents (16 chapters)
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Preface

Using Metadata in Decorators

So far, you've been decorating classes and methods. These are basically pieces of code that get executed, and you have been able to change and augment the code that got executed. But your code consists not only of "active," live code, but of other definitions as well – in particular, your classes have fields, and your methods have parameters. In the activity before this section, you were able to detect whenever the title property was accessed because you had a method that was getting the value, and a method that was setting the value – so you piggybacked your code to the already existing "active" code. But how do you decorate the "passive" parts of your program? You cannot attach code that runs when your "passive" code gets executed, because frankly there's nothing to execute in public firstName: string. It's a simple definition.

You cannot attach any code that gets executed for your...

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