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Example:
I have an NSArray with 40 objects. What is the most efficient way to return ONLY those objects with index equal to a number specified in another NSArray (e.g {0, 27, 36} for example)?
Can a predicate be used here? Or is there a more simple and efficient approach?
Why don’t you just iterate over the index array and look up each index in the data array replacing the index with the looked-up object.
In the end, the array that held the indices now holds the objects. If you don’t want to wipe out your index array, then just create a new array of the same size as the index array and put the objects there.
You might be over-thinking the design of this and falling prey to micro-optimization. (Which is a bad thing.)