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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

TypeScript Interfaces

We'll go through a deep dive into TypeScript interfaces in the next chapter. But for now, just know that an interface allows you to describe the data passed to a class when you're creating an object. In the previous exercise code, if we hover over the Team class on Visual Studio Code, we get the following message:

Figure 4.2: Vague IntelliSense guidance

As you can see in the preceding screenshot, the Visual Studio Code editor's IntelliSense is saying that the players parameter uses the any data type. It's not giving us any usage hints here, and this starts to speak to the reason why we need interfaces, because right now, the players array could be anything. It could be a string, it could be an object, and so on. This is essentially breaking one of the main benefits of using TypeScript in the first place. Ideally, our programs should be declarative to the point that we know exactly what type of data should be passed...

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