Design Patterns examples

Various implementations of different design patterns.

Introduction

This repository is my attempt to make sense of different design patterns, including tangible examples.
Every design pattern and code examples will be located into its own subfolder.

Code Examples

ℹ️ Make sure to have Node and NPM installed.

Inside a terminal run the following commands

npm install -g typescript
npm install -g ts-node

Inside a terminal, navigate to the folder with the code example and run the following command

ts-node index.ts

Design Patterns

Creational	Structural	Behavioral
Abstract Factory	Adapter	Chain of Responsibility
Builder	Bridge	Command
Factory Method	Composite	Interpreter
Prototype	Decorator	Iterator
Singleton	Facade	Mediator
	Flyweight	Memento
	Proxy	Observer
		State
		Strategy
		Template
		Visitor

Design Principles

Design principles are not patterns but can be used as mental reminders when designing software.

• Encapsulate what varies.
• Favor composition over inheritance.
• Program to interfaces, not implementations.
• Strive for loosely coupled designs between objects that interact.
• Classes should be open for extension but closed for modification.
• Depend upon abstractions. Do not depend upon concrete classes.
• The Least amount of Knowledge; Only talk to your immediate friends.
• Don’t call us, we’ll call you.
• A class should have only one reason to change.

Sources

• Head First Design Patterns - O'REILLY
• WikiBooks - Design Patterns
• Refactoring Guru
• Source Making
• Geeks for Geeks - Design Patterns