Book Image

TypeScript Design Patterns

By : Vilic Vane
Book Image

TypeScript Design Patterns

By: Vilic Vane

Overview of this book

In programming, there are several problems that occur frequently. To solve these problems, there are various repeatable solutions that are known as design patterns. Design patterns are a great way to improve the efficiency of your programs and improve your productivity. This book is a collection of the most important patterns you need to improve your applications’ performance and your productivity. The journey starts by explaining the current challenges when designing and developing an application and how you can solve these challenges by applying the correct design pattern and best practices. Each pattern is accompanied with rich examples that demonstrate the power of patterns for a range of tasks, from building an application to code testing. We’ll introduce low-level programming concepts to help you write TypeScript code, as well as work with software architecture, best practices, and design aspects.
Table of Contents (15 chapters)
TypeScript Design Patterns
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface

Prototype


As JavaScript is a prototype-based programming language, you might be using prototype related patterns all the time without knowing it.

We've talked about an example in the Abstract Factory Pattern, and part of the code is like this:

class FreightRocketFactory 
implements RocketFactory<FreightRocket> { 
  createRocket(): FreightRocket { 
    return new FreightRocket(); 
  } 
} 

Sometimes we may need to add a subclass just for changing the class name while performing the same new operation. Instances of a single class usually share the same methods and properties, so we can clone one existing instance for new instances to be created. That is the concept of a prototype.

But in JavaScript, with the prototype concept built-in, new Constructor() does basically what a clone method would do. So actually a constructor can play the role of a concrete factory in some way:

interface Constructor<T> { 
  new (): T; 
} 
 
function createFancyObject...