Shuffling Arrays

Ever want to randomize an array of items? It's a task that, for some reason, I've had to do a lot in recent programs. So, I wrote a handy category on NSArray to handle the task.

NSArray-Shuffle.h

#import 

@interface NSArray(Shuffle)
-(NSArray *)shuffledArray;
@end

NSArray-Shuffle.m

#import "NSArray-Shuffle.h"

@implementation NSArray(Shuffle)
-(NSArray *)shuffledArray
{
 
 NSMutableArray *array = [NSMutableArray arrayWithCapacity:[self count]];
 
 NSMutableArray *copy = [self mutableCopy];
 while ([copy count] > 0)
 {
  int index = arc4random() % [copy count];
  id objectToMove = [copy objectAtIndex:index];
  [array addObject:objectToMove];
  [copy removeObjectAtIndex:index];
 }
 
   [copy release];
   return array;
}
@end