givensur

NSArray *fooArray = @[@1, @2, @2, @3, @3, @3, @4, @4, @4, @4];
NSSet *fooSet = [NSSet setWithArray:fooArray];
NSOrderedSet *fooOrderedSet = [NSOrderedSet orderedSetWithArray:fooArray];

NSLog(@"%d items in array, %d items in set, and %d items in ordered set", 
      [fooArray count], [fooSet count], [fooOrderedSet count]);

NSMutableString *arrayString = [NSMutableString string];
NSMutableString *setString = [NSMutableString string];
NSMutableString *orderedSetString = [NSMutableString string];

for (NSNumber *number in fooArray)
    [string appendString:@"%@ ", number];

for (NSNumber *number in fooSet)
    [string appendString:@"%@ ", number];

for (NSNumber *number in fooOrderedSet)
    [string appendString:@"%@", number];

NSLog(@"Array (in order): %@", arrayString);
NSLog(@"Set (in no particular order): %@", setString);
NSLog(@"Ordered Set (in order): %@", orderedSetString); 

NSLog(@"%@", [fooArray objectAtIndex:2]);
NSLog(@"%@", [fooOrderedSet objectAtIndex:2]);
NSLog(@"%@", [fooSet objectAtIndex:2]);   // will crash here, since sets don't have an objectAtIndex: method

10 items in array, 4 items in set, and 4 items in ordered set
Array (in order): 1 2 2 3 3 3 4 4 4 4 
Set (in no particular order): 3 2 4 1
Ordered Set (in order): 1 2 3 4
2
3
...Exception Raised...unrecognized selector...

Am I allowed to access files/folders in the iPhone file system then as I thought I wasn't?