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Is it possible to get all the keys from a specific NSDictionary as a seperate NSArray?
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NSDictionary / NSMutableDictionary copies keys, and holds strong references to values. NSMapTable is mutable, without an immutable counterpart. NSMapTable can hold keys and values with weak references, in such a way that entries are removed when either the key or value is deallocated.
An NSDictionary will retain it's objects, and copy it's keys.
Main Difference is:NSMutableDictionary is derived from NSDictionary, it has all the methods of NSDictionary. NSMutableDictionary is mutable( can be modified) but NSDictionary is immutable (can not be modified).
An object representing a static collection of key-value pairs, for use instead of a Dictionary constant in cases that require reference semantics.
Just use
NSArray*keys=[dict allKeys]; In general, if you wonder if a specific class has a specific method, look up Apple's own documentation. In this case, see NSDictionary class reference. Go through all the methods. You'll discover many useful methods that way.
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