Unordered array in Foundation?

Question

We have NSSet for a collection of unordered unique elements and NSOrderedSet for a collection of ordered unique elements.

Still, we have NSArray for a collection of ordered non-unique elements, but no data structure for an unordered list of non-unique elements (as far as I know).

Does this container exist in Foundation? Is there a third-party container that manages such? If not either, is there a classy way of getting a randomized sequence of elements from an NSArray?

unordered is not the same as random order. – Sulthan Jul 09 '14 at 16:37 — Sulthan, Jul 09 '14 at 16:37

score 0 · Answer 1 · answered Jul 09 '14 at 16:18

0

Easiest way is to use arc4random_uniform() which returns random numbers in the range:

example:

array[arc4random_uniform(array.count)];

answered Jul 09 '14 at 16:18

Shams Ahmed

4,498
4
21
27

(I didn't mean to get *one* element of the array randomly, rather, to get another array with a randomized sequence of the array's objects.) – Matoe Jul 09 '14 at 16:20
Could you show some code? its can also apply this as well – Shams Ahmed Jul 09 '14 at 16:22

Unordered array in Foundation?

1 Answers1