Re: (no subject)

FROM : j o a r
DATE : Wed Jul 26 21:14:22 2006

On 26 jul 2006, at 20.37, Brad Bumgarner wrote:

> Basically, what I am trying to accomplish is a "shift and roll" of 
> the objects in "anArray." I want to shift every object to the next 
> higher position and "roll" the last object to the first position in 
> the array.


How about this alternative implementation:

if ([array count] > 1)
{
   [array insertObject: [array lastObject] atIndex: 0];
   [array removeLastObject];
}

If you choose to retain your own implementation, keep in mind that 
you would at least need to retain your "roller" object while it's not 
in the array - The array could be the only one retaining it, and in 
that case your implementation would crash!

There also seems to be something wrong with your for-statement 
(should be "x==1", and not "x=1"), but I guess that's a simple typo?

Finally, as a matter style, I think that this method should always 
return the original array, and never *nil* (unless of course, the 
argument to the method is *nil* - in which case you might want to 
consider raising an exception).


j o a r


PS: An alternative approach, and perhaps something that could serve 
as a  tiny exercise for new students of ObjC+Cocoa: This 
functionality seems like something that could be added as a category 
to NSMutableArray, rather than as a method in some other class.