[Newbies] collection enumeration

[cdrick]

> This can be fast if collection is an array and if you say "1 to:
> collection do: [:index | ..."
> instead of creating an interval.  The compiler cheats for to:do: on a
> SmallInteger and doesn't create the block.  But I would only use this
> if the profiler showed it was a real improvement.  Almost always I
> would use option C.

same here or the method Bert has given.. #withIndexDo: