SOLID Principles in JavaScript

Which SOLID principle suggests that software entities should be open for extension but closed for modification?

// Before:
class Rectangle {
  constructor(width, height) {
    this.width = width;
    this.height = height;
  }

  area() {
    return this.width * this.height;
  }
}

// After:
class Shape {
  area() {}
}

class Rectangle extends Shape {
  constructor(width, height) {
    super();
    this.width = width;
    this.height = height;
  }

  area() {
    return this.width * this.height;
  }
}

Single Responsibility Principle
Dependency Inversion Principle
Open/Closed Principle
The Open/Closed Principle (OCP) states that software entities should be open for extension but closed for modification. In the example, instead of modifying the Rectangle class to handle different shapes, we create a base Shape class that can be extended by different shape implementations. This allows adding new shapes without modifying existing code, demonstrating OCP in practice.
Interface Segregation Principle

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