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Can I make a NSMutableArray instance where all the elements are of type SomeClass?
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The main difference is that NSArray is for an ordered collection and NSSet is for an unordered collection. There are several articles out there that talk about the difference in speed between the two, like this one. If you're iterating through an unordered collection, NSSet is great.
arrays can't contain nil.
An object representing a static ordered collection, for use instead of an Array constant in cases that require reference semantics.
You can reverse a NSArray by writing your own loop iterating from the end towards the beginning and using a second array to add the items in reverse order. Or you can simply use - (NSEnumerator *)reverseObjectEnumerator from the NSArray class.
Nobody's put this up here yet, so I'll do it!
Tthis is now officially supported in Objective-C. As of Xcode 7, you can use the following syntax:
NSArray<MyClass *> *myArray = @[[MyClass new], [MyClass new]]; Note
It's important to note that these are compiler warnings only and you can technically still insert any object into your array. There are scripts available that turn all warnings into errors which would prevent building.
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