It has extensive and tight integration with the Objective-C object system, allowing the creation and mutation of the entire object graph, from defining new objects, to defining new classes whose method implementations are provided by lambda expressions; your entire program is a mutable entity to Lark.
The entire language was developed during over the course of 2 days at MHacks and unveiled yesterday. It is currently open source and on Github. Warning: the code is extremely messy,
https://github.com/nateburgers/SnarkDemo/tree/master/SnarkDemo