ooc-dev team mailing list archive

[Amos Wenger <amoswenger@xxxxxxxxx>]

Maybe we should have

   - iterator()
   - backIterator() (can throw exception if unsupported)
   - forward() == iterator()
   - backward() == backIterator() reverse()

The 'iterators are iterable' idiom is particularly useful in cases like
that:

selectWinners: func (c: List<Clients>) {
deluxeLimit := 10

On Fri, May 28, 2010 at 10:20 PM, Noel Cower <ncower@xxxxxxxxx> wrote:

> I like Josh and Rubin's ideas, although I think forward and backward don't
> really communicate that the iterator is going to be at one end or the other
> of the list.  Not all iterables are going to have the ability to go
> forward/backward, so it would make sense, to me at least, to put those in
> List, but then things like HashMap, which are iterable and can have reverse
> iteration, won't have those methods.
>
> Maybe another subclass of Iterable is necessary to give List and HashMap
> the same backing without having them be treated as different in terms of
> their ability to iterate forwards/backwards?  Like BidirectionalIterable or
> EndedIterable (the former being too long and the latter seems a little odd
> to me).
>
> If we do use forward/backward, should backward always be a reverse
> iterator?
>
> Also, iterable iterators sound nice, and I don't really see why we ought to
> not do that - wouldn't cost anything, just have the iterator return itself
> when iterator() is called.
>
>  -noel
>
> On May 28, 2010, at 9:48 AM, Amos Wenger wrote:
>
> I like the proposal of Rubin.
>
> Maybe iterator should be iterable? (they would just return themselves)
>
> In that case we could write:
>
> for(element in list backward())
>>
>
> And ex-Java programmers could even write
>
> for(element in list forward())
>>
>
> If they wanted.
>
> Amos
>
> On Fri, May 28, 2010 at 5:59 PM, cd rubin <launchpad@xxxxxxxxxxxxxxxx>wrote:
>
>>
>> Hey all
>>
>> In which case shouldn't the methods be called 'forwards' and 'backwards'?
>> I think that fits better with the language :
>>
>> "iterate over a list backwards"
>>
>> iter := list backwards()
>>
>> and it removes possible confusion stemming from calling the method 'front'
>> and getting an iterator instead of the first item of the list!
>>
>>  - Daniel (cdrubin)
>>
>> On Fri, May 28, 2010 at 11:21 AM, Josh Roesslein <jroesslein@xxxxxxxxx>wrote:
>>
>>> Bart makes a good point that not all Iterables will have an ordered
>>> structure (ex: socket input/output streams).
>>> I think it would make more sense having front() and back() methods in
>>> List that returns Iterators that either traverse
>>> the list head to tail or vice versa.
>>>
>>> Josh
>>>
>>> On Fri, May 28, 2010 at 9:33 AM, Amos Wenger <amoswenger@xxxxxxxxx>wrote:
>>>
>>>> So what then? iterator~back() ?
>>>>
>>>>
>>>> On Fri, May 28, 2010 at 2:53 PM, Bart van der Werf <bluelive@xxxxxxxxx>wrote:
>>>>
>>>>> I'm not sure.
>>>>>
>>>>> Alot of iterables have no order, so if front/back is the default way to
>>>>> get an iterator it would make little sense.
>>>>>
>>>>
>>>>
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