javascript classes versus functions

class.js

class Klass {
  private _privProperty = 10;

  printHelloTenTimes() {
    for (let i = 0; i < this._privProperty; i++) {
      console.log('Hello');
    }
  }
}

const obj = new Klass();

obj.printHelloTenTimes();

func.js

function Klass() {
  const _privProperty = 10;

  return {
     printHelloTenTimes
  };

  function printHelloTenTimes() {
    for(let i = 0; i < _privProperty; i++) {
      console.log('Hello');
    }
  }
}

const obj = new Klass();

obj.printHelloTenTimes();