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Sample Inheritance

// Helpers.js
export default class Helpers {
  static isDefined(obj) {
    return typeof obj !== 'undefined';
  }
}

export class Storage extends Helpers {
  constructor(isDefined) {
    super(isDefined);
  }
  
  static setStorageItem(key, value) {
    if (this.isDefined(Storage)) {
      if (window.localStorage) {
        const storage = window.localStorage;
        storage.setItem(key, value);
      }
    }
  }
}

// Body.js
import Helpers, { Storage } from '../helpers';

IN Operator

class Car {
  constructor() {
    this.wheels = 4
  }
}
class Fiesta extends Car {
  constructor() {
    super()
    this.brand = 'Ford'
  }
}

const myCar = new Fiesta()
'brand' in myCar //true
'wheels' in myCar //true