Demo of my strange caching strategy

cacheDemo.js

/*globals jQuery*/

function createPromise (url) {
  return new Promise((resolve, reject) => {
    jQuery.ajax({
      url: url,
      success: resolve,
      error: reject
    });
  });
}

class Cache {
  constructor () {
    this._cachedPromises = {};
  }
  get lukeSkywalker () {
    if (!this._cachedPromises.lukeSkywalker) {
      this._cachedPromises.lukeSkywalker = createPromise('http://swapi.co/api/people/1');
    }
    return this._cachedPromises.lukeSkywalker;
  }
  clearLukeSkywalker () {
    delete this._cachedPromises.lukeSkywalker;
  }
  get tatooine () {
    if (!this._cachedPromises.tatooine) {
      this._cachedPromises.tatooine = this.lukeSkywalker.then(luke => {
        return createPromise(luke.homeworld);
      });
    }
    return this._cachedPromises.tatooine;
  }
}

let test = new Cache();
test.tatooine.then(response => console.log(response));
test.lukeSkywalker.then(response => { console.log(response); });