Objective-C To JavaScript Bridge

Nigel Brooke of Steamclock regarding Apples Objective-C to Javascript bridge:

This new API supports straightforward embedding of the JavaScriptCore interpreter into native Objective-C projects, including reading and writing variables and object members with appropriate type coercion, calling methods on JavaScript objects, and directly binding Objective-C objects into JavaScript.

There is an update to this post near the bottom

Francisco Tolmasky pointed out on Hacker News that this API is not entirely new, but is an evolution of some existing parts of WebKit.framework: WebScripting and WebScriptObject.