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Converting between Sets and Arrays

suggest change 
NSSet *set = [NSSet set];
NSArray *array = [NSArray array];

NSArray *fromSet = [set allObjects];
NSSet *fromArray = [NSSet setWithArray:array];
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NSArray:
* NSArray
* Creating Arrays
* Accessing elements
* Reverse an Array
* Converting NSArray to NSMutableArray to allow modification
* Converting between Sets and Arrays
* Using Generics
* Comparing arrays
* Sorting Arrays
* Filtering Arrays With Predicates
* Enumerating using blocks
* Looping through
* Sorting array with custom objects
* Move object to another index
* Deleting Elements
* Insert Elements
* Adding elements
* Finding out the Number of Elements in an Array
* Add objects to NSArray
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