Abstract Classes for Shared Logic

Snippet

Abstract Classes for Shared Logic

Abstract classes cannot be instantiated directly. They serve as templates, allowing you to define shared methods while forcing subclasses to implement specific 'abstract' logic.

snippet.ts
typescript
abstract class Shape {
  constructor(public color: string) {}
  abstract getArea(): number;
 
  printColor() {
    console.log(`Color: ${this.color}`);
  }
}
 
class Circle extends Shape {
  constructor(color: string, private radius: number) {
    super(color);
  }
  getArea() { return Math.PI * this.radius ** 2; }
}

Breakdown

abstract getArea(): number;

Defines a method signature that must be implemented by any non-abstract child class.

printColor() { ... }

A concrete method that is inherited and usable by all subclasses.

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Abstract Classes for Shared Logic

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