How to copy last object of array to other array?

how would you copy the last object of a array and then add the object to some array. So in other words i want to take 开发者_开发技巧the last object of someArray and copy that lastObject to someArray2.

Thanks,

-David

NSArray *firstArray = [[NSArray alloc] init];
... populate firstArray ...
NSArray *secondArray = [NSArray arrayWithObject:[firstArray lastObject]];

or

NSArray *firstArray = [[NSArray alloc] init];
... populate firstArray ...
NSMutableArray *secondArray = [NSMutableArray alloc] init];
[secondArray addObject:[firstArray lastObject]];

or

NSArray *firstArray = [[NSArray alloc] init];
... populate firstArray ...
NSArray *secondArray = [[NSArray alloc] init];
NSArray *thirdArray = [secondArray arrayByAddingObject:[firstArray lastObject]];

Make sure everything is released as you now own all these references.

Edit: If you want a COPY everywhere there's [firstArray lastObject] change it to [[[firstArray lastObject] copy] autorelease] (thanks tc)