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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

The Evolution of and Motivation for Promises

As we've learned, a callback is a function that is given as an argument to another function, in effect saying, "do this when you are done." This capability has been in JavaScript since its inception in 1995 and can work very well, but as the complexity of JavaScript applications grew through the 2000s, developers found callback patterns and nesting in particular to be too messy and unreadable, giving rise to complaints about "callback hell" as shown in the following example:

doSomething(function (err, data) {
  if(err) {
    console.error(err);
  } else {
    request(data.url, function (err, response) {
      if(err) {
        console.error(err);
      } else {
        doSomethingElse(response, function (err, data...

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