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As per subject, how can I check whether an object is an NSArray or NSDictionary?
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The key difference: NSMutableDictionary can be modified in place, NSDictionary cannot. This is true for all the other NSMutable* classes in Cocoa. NSMutableDictionary is a subclass of NSDictionary, so everything you can do with NSDictionary you can do with both.
An object representing a static collection of key-value pairs, for use instead of a Dictionary constant in cases that require reference semantics.
The workhorse of collection types is the array. In Objective-C, arrays take the form of the NSArray class. An NSArray represents an ordered collection of objects. This distinction of being an ordered collection is what makes NSArray the go-to class that it is.
[myDictionary setObject:nextValue forKey:myWord]; You can simply say: myDictionary[myWord] = nextValue; Similarly, to get a value, you can use myDictionary[key] to get the value (or nil).
if([obj isKindOfClass:[NSArray class]]){ //Is array }else if([obj isKindOfClass:[NSDictionary class]]){ //is dictionary }else{ //is something else } Try
[myObject isKindOfClass:[NSArray class]] and
[myObject isKindOfClass:[NSDictionary class]] Both of these should return BOOL values. This is basic use of the NSObject method:
-(BOOL)isKindOfClass:(Class)aClass For a bit more information, see this answer here: In Objective-C, how do I test the object type?
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