在this.state中使用嵌套对象的最佳方法是什么？

constructor(props) {
  super(props);
  this.state = {
    user: {
      name: 'John',
      age: 25,
      address: {
        city: 'New York',
        country: 'USA'
      }
    }
  };
}

this.setState(prevState => ({
  user: {
    ...prevState.user,
    address: {
      ...prevState.user.address,
      city: 'Los Angeles'
    }
  }
}));

const { name } = this.state.user;
const { city } = this.state.user.address;