builder-pattern.ts

class House {
  address?: string;
  postCode?: string;

  constructor() { }
}

class HouseBuilder {
  private readonly _house: House;

  constructor() {
    this._house = new House();
  }
  setAddress(address: string) {
    this._house.address = address;
    return this;
  }
  setPostCode(postCode: string) {
    this._house.postCode = postCode;
    return this;
  }
  build() {
    return this._house;
  }
}