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I want to build an array of strings, that can point every time to a different string. I saw that I can use NSArray and NSMutableArray.
What is the difference between them?
Straight from Apple:
NSArray
NSMutableArray
Main difference:
NSArray is non-mutable, meaning it cannot be altered once it is created and is usually faster and carries less of a memory footprint than its mutable counterpart.
NSMutableArray can be changed after it is created.
There are more differences than just that, but the documentation goes over them better than I can. I also recommend watching the free IOS Development lectures from Stanford available on iTunes. They go into the different data structures and how they can be used in much greater depth.