function User (theName, theEmail) {
    var FLAG = 9; // PRIVATE VARIABLE
    this.name = theName;
    this.email = theEmail;
    this.quizScores = [];
    this.currentScore = 0;
    
    // La siguiente función SIRVE PARA RETORNAR ATRIBUTOS PRIVADOS
    this.getFlag = function() {
        return FLAG;
    }
}

User.prototype = {
    constructor: User,
    saveScore:function (theScoreToAdd)  {
        this.quizScores.push(theScoreToAdd)
    },
    showNameAndScores:function ()  {
        var scores = this.quizScores.length > 0 ? this.quizScores.join(",") : "No Scores Yet";
        return this.name + " Scores: " + scores;
    },
    changeEmail:function (newEmail)  {
        this.email = newEmail;
        return "New Email Saved: " + this.email;
    }
}

// O TAMBIÉN SE PUEDE UTILIZAR LA SIGUIENTE SINTAXIS:

User.prototype.changeEmail = function (newEmail)  {
  this.email = newEmail;
  return "New Email Saved: " + this.email;
}