How to add methods to a (JSON) object's prototype?

Question

Let\'s say I receive some JSON object from my server, e.g. some data for a Person object:

{firstName: \"Bjarne\", lastName: \"Fisk\"}

Now,

Answer 1

Anonymous objects don't have a prototype. Why not just have this:

function fullName(obj) {
    return obj.firstName + ' ' + obj.lastName;
}

fullName(person);

If you absolutely must use a method call instead of a function call, you can always do something similar, but with an object.

var Person = function (person) { this.person = person; }
Person.prototype.fullName = function () {
    return this.person.firstName + ' ' + this.person.lastName;
}
var person = new Person(personData);
person.fullName();