namespace.js

var namespace = function (obj, ns) {
  var props = ns.split('.'),
      prop;
  do {
    prop = props.shift();
    obj = obj[prop] = obj[prop] || {};
  } while (props.length > 0);
  return obj;
};

// var foo = {};
// namespace(foo, 'deeply.nested.namespace');
// console.dir(foo);

// Simple is better?






// Version with optional arguments

var namespace = function (ns /*, o, d */) {
  var o = (arguments.length > 1) ? arguments[1] : window,
      d = (arguments.length > 2) ? arguments[2] : '.',
      s = ns.split(d),
      i, n, p;
  for (i = 0, n = s.length; i < n; i = i + 1) {
    p = s[i];
    o = o[p] = o[p] || {};
  }
};

/**
 * Usage:
 */
 console.group("var obj = {}; namespace('deeply.nested.foo', obj);");
 var obj = {};
 namespace('deeply.nested.foo', obj);
 console.dir(obj);
 console.groupEnd("var obj = {}; namespace('deeply.nested.foo', obj);");

/**
 * obj = {
 *   deeply: {
 *     nested: {
 *       foo: {}
 *     }
 *   }
 * }
 */


// Supports multiple namespaces as comma-delimited list

var namespaceMulti = function (ns /*, obj, d */) {

  ns = ns.split(/\s*,\s*/);

  var obj = (arguments.length > 1) ? arguments[1] : window,
      d = (arguments.length > 2) ? arguments[2] : '.',
      j, m, o, s, i, n, p;

  for (j = 0, m = ns.length; j < m; j = j + 1) {
    o = obj;
    s = ns[j].split(d);
    for (i = 0, n = s.length; i < n; i = i + 1) {
      p = s[i];
      o = o[p] = o[p] || {};
    }
  }
};

/**
 * Usage:
 */
console.group("var obj = {}; namespaceMulti('deeply.nested.boo, deeply.nested.foo.bar, deeply.nested.foo.baz', obj);");
var obj = {};
namespaceMulti('deeply.nested.boo, deeply.nested.foo.bar, deeply.nested.foo.baz', obj);
console.dir(obj);
console.groupEnd("var obj = {}; namespaceMulti('deeply.nested.boo, deeply.nested.foo.bar, deeply.nested.foo.baz', obj);");

/**
 * obj = {
 *   deeply: {
 *     nested: {
 *       boo: {},
 *       foo: {
 *         bar: {},
 *         baz: {},
 *       }
 *     }
 *   }
 * }
 */