Answer 1

class mockLocalStorage {
  constructor() {
    this.store =  {}
  }
  getItem(key) {
    return this.store[key] || null
  }
  setItem(key,value) {
    this.store[key] = value
  }
  removeItem(key) {
    delete this.store[key]
  }
  clear() {
    this.store = {}
  }
}
window.localStorage2 = new mockLocalStorage()