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
About the Author
About the Reviewer

Chapter 3. Creational Design Patterns

Creational design patterns in object-oriented programming are design patterns that are to be applied during the instantiation of objects. In this chapter, we'll be talking about patterns in this category.

Consider we are building a rocket, which has payload and one or more stages:

class Payload { 
  weight: number; 
class Engine { 
  thrust: number; 
class Stage { 
  engines: Engine[]; 

In old-fashioned JavaScript, there are two major approaches to building such a rocket:

  • Constructor with new operator

  • Factory function

For the first approach, things could be like this:

function Rocket() { 
  this.payload = { 
    name: 'cargo ship' 
  this.stages = [ 
      engines: [ 
        // ... 
var rocket = new Rocket(); 

And for the second approach, it could be like this:

function buildRocket...