jdb - a javascript object manager

<script>
var options = {
    basePath: "/admin/test",
    headers: {},
    objects: {
        'default': [
            {
                name: "foo",
                id: "bar"
            }
        ]
    }
};
var jdb = (function(options){

    var defaultNamespace = 'default';

    var defaults = {
        basePath: window.location.pathname,
        headers: {},
        objects: {
            defaultNamespace: {}
        }
    };
    var objects = {};  // Object containing 'namespace': [{obj1}, {obj2}, {obj3}]
    var namespaces = [];  // List of namespace names.

    for (var n in options){
        defaults[n]=options[n];
    }

    this.getObjects = function(ns) {
        ns = 'undefined' ? defaultNamespace: ns;
        if (namespaces.indexOf(ns) === -1) {
            return [];
        }
        return objects[ns];
    };

    this.getObject = function(id, ns) {
        ns = 'undefined' ? defaultNamespace : ns;
        if (namespaces.indexOf(ns) === -1) {
            return null;
        }
        for (var i in objects[ns]) {
            if (objects[ns][i]['id'] === id) {
                return objects[ns];
            }
        }

        return null;
    };

    this.getNamespaces = function() {
        return namespaces
    };

    this.addObject = function(obj, namespace) {
        if (typeof obj['id'] === 'undefined') {
            throw "jdb.addObject requires objects contain a id key.";
        }
        namespace = 'undefined' ? defaultNamespace: namespace;
        if (typeof objects[namespace] === 'undefined') {
            objects[namespace] = [];
        }
        obj['__jdb_ns'] = namespace;
        objects[namespace].push(obj);
    };


    for (var ns in defaults.objects) {
        namespaces.push(ns);
        for (var obj_i = 0; obj_i < defaults.objects[ns].length; obj_i++) {
            addObject(defaults.objects[ns][obj_i]);
        }
    }
    if (namespaces.indexOf(defaultNamespace) === -1) {
        namespaces.push(defaultNamespace);
        objects[defaultNamespace] = [];
    }

    return this;
});

var inst = jdb(options);
inst.addObject(
    {
        id: "12345",
        name: "Foo"
    }
);
inst.getObject('12345');
</script>