var User = (function(id, name, pass) {

    var _id = id || "";
    var _name = name || "";
    var _pass = pass || "";

    function setId(id) {
        _id = id;
        return fns;
    }

    function setName(name) {
        _name = name;
        return fns;
    }

    function setPass(pass) {
        _pass = pass;
        return fns;
    }

    function info() {
        var str = "{\"id\":"+_id+", \"name\":\""+_name+"\", \"pass\":\""+_pass+"\"}";
        document.write(str);
        return fns;
    }

    var fns = {
        "setId": setId,
        "setName": setName,
        "setPass": setPass,
        "info": info
    };

    return fns;

});

/// 1. kullanım
var user = User(1, "Qeremy", "uGL320");
user.info();

/// 2. kullanım
var user = User();
user.setId(1);
user.setName("Qeremy");
user.setPass("uGL320");
user.info();

/// 3. kullanım
User().setId(1).setName("Qeremy").setPass("uGL320").info();