//Object.create

var personProto = {
	calculateAge: function() {
		console.log(2016 - this.yearOfBirth);
	}
};

var john = Object.create(personProto);
john.name = 'John';
john.yearOfBirth = 1990;
john.job = 'teacher';

var jane = Object.create(personProto, {
	name: { value: 'Jane'},
	yearOfBirth: { value: 1968},
	job: { value: 'Designer'}
});