JavaScript: Crear namespaces

createNS.js

//utility to create safe namespaces
function createNS (namespace) {
    var nsparts = namespace.toString().split("."),
        reName = (/^[A-Za-z_]\w+/),
        cparent = window,
        i, subns, nspartsLength;
    // we want to be able to include or exclude the root namespace so we strip it if it's in the namespace
    if (nsparts[0] === "window") nsparts = nsparts.slice(1);
    // loop through the parts and create a nested namespace if necessary
    for (i = 0, nspartsLength = nsparts.length; i < nspartsLength; i += 1) {
        subns = nsparts[i];
        // check if the namespace is a valid variable name
        if (!reName.test(subns)) throw new Error("Incorrect namespace");
        // check if the current parent already has the namespace declared,
        // if it isn't, then create it
        if (typeof cparent[subns] === "undefined") {
            cparent[subns] = {};
        }
        cparent = cparent[subns];
    }
    i = subns = nsparts = nspartsLength = reName = void(0);
    // the parent is now constructed with empty namespaces and can be used.
    // we return the outermost namespace
    return cparent;
}

usage.js

// WAY 1: we can create the structure with local references
(function () {
    // If you use local/cached references is recommended declare them
    // within a function or module at the top of your function scope;
    // this is called: Dependency declaration pattern
    var _2d = createNS("animation.g2D"),
        _3d = createNS("animation.g3D");

  // you can get the reference of created namespaces
  _2d.slide = function() {};
  _3d.cubic = function() {};
}());

// WAY 2: passing the object reference as a proxy
(function (proxy2D) {
    proxy2D.slide = function() {};
})(createNS("animation.g2D"));

(function (proxy3D) {
    proxy3D.cubic = function() {};
})(createNS("animation.g3D"));

// WAY 3...n, you can use Module Pattern: loose augmentation, etc...

Esta función esta implementada en la librería JSU