A mutable array backed by a JavaScript Array.A mutable array class backed by a JavaScript Array. There is also a CPMutableArray class, but it is just a child class of this class with an empty implementation. All mutable functionality is implemented directly in CPArray
CPFormatter is an abstract class that declares an interface for objects that create, interpret, and validate the textual representation of cell contents. The Foundation framework provides two concrete subclasses of CPFormatter to generate these objects: CPNumberFormatter and CPDateFormatter
1.8.8 
