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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
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2
2. Declaration Files
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5
5. Interfaces and Inheritance
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6
6. Advanced Types
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8
8. Dependency Injection in TypeScript
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9
9. Generics and Conditional Types
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11. Higher-Order Functions and Callbacks
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Function Expressions

Function expressions differ from function declarations in that they can be assigned to variables, used inline, or invoked immediately – an immediately invoked function expression or IIFE. Function expressions can be named or anonymous. Let's look at a few examples:

Example09.ts

1 const myFunction = function(name: string): string {
2   return `Hello ${name}!`;
3 };
4 console.log(myFunction('function expression'));

You will get the following output:

Hello function expression!

This looks quite a lot like a previous example we looked at, and it works almost exactly the same. Here is the function declaration for comparison:

function myFunction(name: string = 'world'): string {
  return `Hello ${name}!`;
}

The one slight difference is that function declarations are hoisted, meaning they are loaded into memory (along with any declared variables) and...

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