libffi is a Foreign Function Interface (ffi) library, allowing

• runtime call of any function
• creating callable pointers of any type given a function type encoding (libffi calls those closures)

Used with BridgeSupport, JSCocoa can therefore call any function or any method of any class, at any time.

By using FFIclosure, JSCocoa can create callable methods for new classes. See JavascriptObjCClass.