On Tuesday 01 January 2013 20:02:15 Rick McGuire wrote:
> On Tue, Jan 1, 2013 at 8:30 PM, Leslie Turriff
<jlturr...@centurytel.net>wrote:
> > I'm reading the Programming Guide, trying to get a grip on the
> > allowed
> > attributes for the indices of each type of collection.
> > The Programming Guide says, "Each item stored in a
> > Rexx collection has an associated index that you can use to retrieve the
> > item
> > from the collection with the AT or [] (left and right bracket) methods,
> > and each collection deļ¬nes its own acceptable index types:". It goes on
> > to describe the indexes for each collection type, but some of them are
> > rather vague:
> > "Array A sequenced collection of objects ordered by whole-number
> > indexes."
> >
> > Okay, that's clear enough...
> >
> > "List A sequenced collection that lets you add new items
> > at any position
> > in the sequence. A list generates and returns an index value for each
> > item placed in the list. The returned index remains valid until the item
> > is removed from the list."
> >
> > Hmmm...so is a list index allowed to be an integer? A real number?
> > Non-numeric?
> > Help!
> >
> >
> >From the documentation of the list class:
>
> The List creates a new index value whenever an item is added to the list
> and the associated index value remains valid for that item regardless of
> other additions or removals. Only
> indexes the list object generates are valid i.e. the list is never a sparse
> list and the list object will not
> modify indexes for items in the list.
> Draft
>
> Whenever an item is inserted into the list, an index is assigned to that
> value. This index will remain valid for that item regardless of any other
> insertions or deletions that may occur with the list.
>
> Rick
>
Okay, let's try this again.
Is a list index allowed to be an integer? A real number? Non-numeric?
Leslie
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