gistfile1.js

// Simplified one-liner version with a bit of added functionality
String.prototype.namespace = function(objects, scope, separator){
  return Object.extend(this.split(separator || '.').inject((scope || window), function(parent, child){
  	return (parent[child] = parent[child] || {});
  }), objects || {});
}
 
// Sample usage
'com.pixeldepo.some.package'.namespace();
'com.pixeldepo.some.other.package'.namespace();
'foo.bar'.namespace({}, 'com.pixeldepo'); // creates com.pixeldepo.foo.bar
'foo::bar'.namespace({}, 'com.pixeldepo', '::'); // creates com.pixeldepo.foo.bar
'bar.baz'.namespace({ foo: 'bar' }); // creates bar.baz and adds { foo: 'bar' } to it