Builder

• Instead of defining each property through the constructor, use separate methods for that
• Allows chaining methods

class HotDog {
  constructor(
    public bread: string,
    public ketchup?: boolean,
    public mustard?: boolean,
    public kraut?: boolean
  ) {}

  addKetchup() {
    this.ketchup = true;
    return this;
  }
  addMustard() {
    this.mustard = true;
    return this;
  }
  addKraut() {
    this.kraut = true;
    return this;
  }
}

const myLunch = new HotDog("gluten free").addKetchup().addMustard().addKraut();