Creating javascript namespaces

namespace.js

// Chatham Namespace for exposing javascript functionality
// We can expose all of our functionality via this one global var
var CHATHAM = CHATHAM || {};

CHATHAM.namespace = function (namespace_name_string) {
  var parts = namespace_name_string.split('.'),
      parent = CHATHAM,
      i, cnt;

  // remove the first part of the string which will be 'CHATHAM'
  if (parts[0] === 'CHATHAM') {
    parts = parts.slice(1);
  }

  cnt = parts.length;
  for (i = 0; i < cnt; i += 1) {
    // create and add the property if it doesn't exist
    if (typeof parent[parts[i]] === 'undefined') {
      parent[parts[i]] = {};
    }

    parent = parent[parts[i]];
  }

  return parent;
};