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)

Generics

The word generics refers to using variable types, that is, parameters that at a later time will be bound to actual types. Parametric types were first introduced in C++ templates, then they took the name generics in Java and in C#. The main difference between C++ and Java/C# implementation is that C++ parametric types disappear at runtime; only the complete types obtained by substituting actual types to all template parameters survive at runtime.

On the contrary, in C# and Java, data structures (classes, interfaces, functions) based on generics are legal runtime types. In fact, any C# programmers with some experience in reflection know that a generic class can be dynamically instantiated at runtime with actual types.

TypeScript has a generics implementation that mimics C# syntax, but, as in C++, TypeScript generics live just at compilation time and disappear at runtime...