JavaScript namespace helper

nefarious-namespace.js

/* jshint esnext: true */
(function (){
    "use strict";

    let NEF = window.NEF || {};

    NEF.namespace = function() {
        let ln = arguments.length, i, value, x, xln, parts, object;

        for (i = 0; i < ln; i++) {
            value = arguments[i];
            parts = value.split(".");
            object = window[parts[0]] = Object(window[parts[0]]);

            for (x = 1, xln = parts.length; x < xln; x++) {
                object = object[parts[x]] = Object(object[parts[x]]);
            }
          }
          return object;
    };

    NEF.ns = NEF.namespace;
    window.NEF = NEF;
})();