function AppleBasket(apples) {

  var _apples = Math.abs(apples) || 0,

      _msg = document.getElementById('msg');     

  var howMany = function () {

    _log('You have ' +

    _apples + ' apples in your basket.'); 

  };

  var add = function () {

    if (_apples < 12) {

      _apples++;

      this.howMany();               

    } else {

      _log('Your basket is full!');       

    }

​

  };

  var eat = function () {

    if (_apples > 0) {

      _apples--;

      this.howMany();

    } else {

      _log('You have no more apples to eat!');

    }

  };

  var _log = function (msg) {

    _msg.innerText = msg;

  };

  return {

    howMany: howMany,

    add: add,

    eat: eat

  };

}

​

var apples = new AppleBasket(-1);

document.getElementById('add').onclick = function () { apples.add(); };

document.getElementById('eat').onclick = function () { apples.eat(); };

​

// console.log(document);