For Medium Article: https://medium.com/swlh/protect-your-javascript-applications-from-api-data-401a73c7c80b

exampleBaseModel2.js

import LocationModel from './LocationModel';
import CarModel from './CarModel';

import {BaseModel} from 'sjs-base-model';

class PersonModel extends BaseModel {
  firstName = '';
  lastName = '';
  age = 0;
  address = LocationModel; // Creates a new LocationModel if there is address data
  cars = [CarModel]; // Create an array of CarModel's or empty array if there is no data

  constructor(data) {
    super();

    // Calls the update method on BaseModel
    this.update(data);
  }
}