gistfile1.txt

var userComponent = {
  fullName: function () { return this.firstName + ' ' + this.lastName; },
  get: function (key, value) { return this[key] || (value || ''); },
};

var evandro = Object.create(userComponent, {
  'firstName': { value: 'Evandro', enumerable: false },
  'lastName': { value: 'Ribeiro', enumerable: false }
});

console.log(evandro.fullName());
console.log(evandro.get('firstName'));
console.log(evandro.get('lastName'));
console.log(evandro);