Prototype.ts

interface CarPrototype {
    clone(): CarPrototype
  }
  
  class Audi implements CarPrototype {
    clone(): CarPrototype {
      return new Audi()
    }
  }
  
  class Benz implements CarPrototype {
    clone(): CarPrototype {
      return new Benz()
    }
  }
  
  class BMW implements CarPrototype {
    clone(): CarPrototype {
      return new BMW()
    }
  }
  
  abstract class CarFactory {
    abstract createCar(brand: string): CarPrototype;
  }
  
  class ChineseCarFactory extends CarFactory {
    private brands: { [brand: string]: CarPrototype; } = {};
  
    constructor() {
      super()
      this.brands['Audi'] = new Audi()
      this.brands['Benz'] = new Benz()
      this.brands['BMW'] = new BMW()
    }
  
    createCar(brand: string): CarPrototype {
      return this.brands[brand].clone()
    }
  }
  
// USAGE:
const factory = new ChineseCarFactory()
const prototypes = ['Audi', 'Benz', 'BMW'].map((brand) => {
  return factory.createCar(brand)
})
console.log(prototypes)
// OUTPUT:
// [Audi: {}, Benz: {}, BMW: {}]