Lambdas are clean, but limited in current Java compared to nested blocks.
Are full featured lambdas on the horizon?
If not, then we still need loops and iterators.
Alan
> On Dec 20, 2018, at 3:00 PM, Remi Forax <fo...@univ-mlv.fr> wrote:
>
> or
> map.forEach((key, value) -> {
> ...
> });
>
> Rémi
>
> ----- Mail original -----
>> De: "Brian Goetz" <brian.go...@oracle.com>
>> À: "Alan Snyder" <fishgar...@cbfiddle.com>, "core-libs-dev"
>> <core-libs-dev@openjdk.java.net>
>> Envoyé: Jeudi 20 Décembre 2018 23:50:15
>> Objet: Re: enhanced for loop with multiple iteration variables
>
>> For Map, you can do:
>>
>> for (Map.Entry<K,V> e : map.entrySet()) { ... }
>>
>> and you're already there.
>>
>>
>>
>> On 12/19/2018 9:54 AM, Alan Snyder wrote:
>>> Has any consideration been given to supporting iterators that provide more
>>> than
>>> one iteration variable in the enhanced for loop?
>>>
>>> Obvious uses would be maps (keys and values) and lists (indexes and values).
>>>
>>> I have in mind keeping the syntactic sugar approach by using one or more
>>> extensions of the Iterator/Iterable interfaces, such as, for example:
>>>
>>> interface Iterator2<E1,E2> extends Iterator<E1> {
>>> E2 get2();
>>> }
>>>
>>> with the extra methods providing the values for the extra variables
>>> (associated
>>> with the previous call to next).
>>>
>>> Extending interfaces is not required, but it makes the trailing variables
>>> optional, which might be useful. For example, the same iterator could
>>> provide
>>> values or values and keys.
>>>
>>> The fact that this approach only works for a fixed set of numbers of
>>> variables
>>> does not bother me unduly.
>>>
>>> Alan
>
