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Typescript essentials

Typescript essentials

By : Christopher Nance
4 (4)
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Typescript essentials

Typescript essentials

4 (4)
By: Christopher Nance
Buy this Book

Overview of this book

The book introduces the TypeScript language and its features to anyone looking to develop rich web applications. Whether you are new to web development or are an experienced engineer with strong JavaScript skills, this book will get you writing code quickly. A basic understanding of JavaScript and its language features are necessary for this book.
Table of Contents (10 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Getting Started with TypeScript
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1. Getting Started with TypeScript
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The advantages of TypeScript
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Setting up the IDE
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Hello World
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Summary
2
2. TypeScript Basics
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2. TypeScript Basics
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Types
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Functions
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Interfaces
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Classes
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Interfaces
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Enums
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Modules
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Generic objects
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Summary
3
3. The TypeScript Compiler
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3. The TypeScript Compiler
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Generation of ECMAScript
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Controlling compiler output
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Advanced options
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Summary
4
4. Object-oriented Programming with TypeScript
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4. Object-oriented Programming with TypeScript
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The basics
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Understanding inheritance
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Encapsulation
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Abstraction
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Polymorphism
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References
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Summary
5
5. Creating a Simple Drawing Application
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5. Creating a Simple Drawing Application
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Setting up the project
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The shapes
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Making the application interactive
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Summary
6
6. Declaration Files and Library Integrations
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6. Declaration Files and Library Integrations
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Declaration files
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Third-party library integration
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Summary
7
7. Enhancing the Drawing Application
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7. Enhancing the Drawing Application
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Converting to AMD modules
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Binding the user controls
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Generating a single output file
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Styling the application
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Summary
8
8. Debugging TypeScript
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8. Debugging TypeScript
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Debugging
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Test-driven development
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Summary
9
Index
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Index

Abstraction

Abstraction is an incredibly powerful concept in object-oriented development. It encompasses the idea of hiding specific implementation details while providing the high-level definition of what should be implemented. In the previous example, we saw a very basic case of abstraction. The IActivator interface creates the abstraction layer needed to handle the concept of activating the application. The LocalActivator and ServerActivator types are concrete implementations of this abstraction. In other programming languages such as C#, classes are able to declare specific members as abstract. This forces any subclasses of the base type to provide a concrete implementation of that member. In the following code segment, you will see a C# example of this:

public abstract class AbstractBaseClass
{
    protected bool isActive = false;
    public AbstractBaseClass()
    {
    }
    public abstract bool CheckStatus();
}
public class ConcreteClass : AbstractBaseClass
{
    public ConcreteClass...
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