class Book {
  constructor(author) {
    this._author = author;
  }
  // getter
  get writer(){
    return this._author;
  }
  // setter
  set writer(updatedAuthor){
    this._author = updatedAuthor;
  }
}

function makeClass() {

  return Thermostat;
}

const Thermostat = makeClass();
const thermos = new Thermostat(76); 
let temp = thermos.temperature; 
thermos.temperature = 26;
temp = thermos.temperature;