sum-areas-of-shapes

This project implements a system to calculate areas of flat shapes and volumes of solid shapes using object composition. Each shape adheres to a specific contract, making it easy to extend the program without modifying existing code, following the SOLID principles.

The project is ideal for practicing:

• Object composition in JavaScript

• Design patterns and SOLID principles

• Extensible and maintainable code architecture

Features

• Supports multiple flat shapes (e.g., square, rectangle, circle)

• Supports multiple solid shapes (e.g., cube, cylinder, sphere)

• Open for extension: new shapes can be added without modifying existing code

• Clear separation of concerns and contracts for each shape

• Demonstrates modern JavaScript practices

Usage

git clone https://github.com/Yeison0416/sum-areas-of-shapes.git

cd sum-areas-of-shapes

Demo Guide

1. Open a Node.js environment (v14+ recommended)

2. Navigate to the project folder

3. Run a demo file or create a custom file importing shapes and calculators

4. Observe area and volume outputs in the console

Concepts

• Object Composition: Shapes are created through composition rather than inheritance, following the principle of “composition over inheritance.”

• SOLID Principles:

  • S: Single Responsibility – each shape handles only its own properties

  • O: Open/Closed – new shapes can be added without changing existing code

  • L: Liskov Substitution – all shapes implement their contract

  • I: Interface Segregation – each shape has minimal required properties

  • D: Dependency Inversion – calculators depend on shape abstractions