Director.js

class Director {
  constructor(builder) {
    this.builder = builder;
  }

  constructFamilyHouse() {
    return this.builder
      .buildWalls(4)
      .buildRoof('sloped')
      .buildGarden(['trees', 'grass', 'peacocks'])
      .getHouse();
  }

  constructMansion() {
    // Steps for building a mansion
  }
}

const director = new Director(new HouseBuilder());
const familyHouse = director.constructFamilyHouse();