Lambdas in for-each loops

[Sergey Kuksenko]

On 09/05/2012 05:51 PM, Remi Forax wrote:
> On 09/05/2012 03:26 PM, Brian Goetz wrote:
>>> At such case I have a serious question - why for-each loop doesn't 
>>> allow
>>> to use Iterator? Why do we need only Iterable (and arrays of course) ?
>>> May be it may sense to expand for-each loop itself and detach the
>>> problem from lambda? it looks like we something like project Coin2.0 
>>> for
>>> such things.
>>
>> This was a hot issue during the development of the foreach loop. In 
>> the end, the EG decided that allowing Iterator in foreach loop was 
>> potentually confusing, since as a side effect of being iterated, the 
>> iterator was "drained".
>>
>>
> Also, you can write horrible things like,
>   Iterator<String> it = collection...
>   for(String s: it) {   // ok, simple loop
>    if (...) {
>       ...
>       it.remove();   // not a simple loop anymore
>     }
>   }
>
> if you read the code, a foreach loop should always be a simple loop 
> with no side effect on the iterable.
>
> Rémi
>
Ok. Let's do:

   Iterator<String> it = collection...
   for(String s: asIterable(it) /*or lambda*/) {   // ok, simple loop
    if (...) {
       ...
       it.remove();   // not a simple loop anymore
     }
   }

I see the same.

-- 
Best regards,
Sergey Kuksenko