JavaScript namespacing with Underscore

namespace.js

function namespace(string, obj) {
  var current = window,
      names = string.split('.'),
      name;

  while(name = names.shift()) {
    current[name] = current[name] || {};
    current = current[name];
  }

  _.extend(current,obj);
}

// usage
namespace('Superawesome', {
  Function: function() {
    // awesome output
  }
});

namespace('Superawesome.Second', {
  Wow: function() {

  }
});