Book Image

Hands-On TypeScript for C# and .NET Core Developers

By : Francesco Abbruzzese
5 (1)
Book Image

Hands-On TypeScript for C# and .NET Core Developers

5 (1)
By: Francesco Abbruzzese

Overview of this book

Writing clean, object-oriented code in JavaScript gets trickier and complex as the size of the project grows. This is where Typescript comes into the picture; it lets you write pure object-oriented code with ease, giving it the upper hand over JavaScript. This book introduces you to basic TypeScript concepts by gradually modifying standard JavaScript code, which makes learning TypeScript easy for C# ASP.NET developers. As you progress through the chapters, you'll cover object programming concepts, such as classes, interfaces, and generics, and understand how they are related to, and similar in, both ES6 and C#. You will also learn how to use bundlers like WebPack to package your code and other resources. The book explains all concepts using practical examples of ASP.NET Core projects, and reusable TypeScript libraries. Finally, you'll explore the features that TypeScript inherits from either ES6 or C#, or both of them, such as Symbols, Iterables, Promises, and Decorators. By the end of the book, you'll be able to apply all TypeScript concepts to understand the Angular framework better, and you'll have become comfortable with the way in which modules, components, and services are defined and used in Angular. You'll also have gained a good understanding of all the features included in the Angular/ASP.NET Core Visual Studio project template.
Table of Contents (16 chapters)

Introduction to TypeScript

The implementation of large JavaScript code bases in modern, rich client web applications has always pushed more in the direction of preventing hard-to- find bugs, with exhaustive checking at compile time. TypeScript meets this requirement by transforming JavaScript into a strongly typed language; that is, into a language that requires declarations and type specifications for all variables and properties. In fact, strong typing allows compile-time type checking that prevents the misuse of variables and functions while variable declarations avoid the variable names misspelling that often causes these bugs in JavaScript.

This chapter explains the TypeScript manifest, how to install it and add it to your ASP.NET core projects, how to organize files and compile them to JavaScript, and the basics of TypeScript configuration. Then the chapter introduces the basics of types and variable declarations.

The following topics will be covered in this chapter:

  • Installation on Windows and the TypeScript mission
  • Adding TypeScript to ASP.NET core web projects and debugging it
  • Basics of TypeScript configuration
  • Simple types, enums, and basics of Union types
  • Variable declarations, scoping, expressions, casting, and string interpolation