Substitute for groupingReduce ?

[Brian Goetz]

The quick summary here is that groupingReduce got folded into 
groupingBy, which became possible by loosening the specification of 
Collector to allow reduce to be defined as a Collector.  That made a lot 
of variants in Collectors go away.

On 3/20/2013 3:36 PM, Brian Goetz wrote:
> I think you're missing a reduce function in that call?  I see a
> classifying function and a merge function.
>
> But here are some possible answers:
>
>     Cities by name:
>     Map<String, List<City>> citiesByName
>       = cities.stream().collect(groupingBy(City::getName));
>
>     Total population by name:
>     Map<String, Integer> cityPopsByName
>       = cities.stream()
>               .collect(groupingBy(City::getName,
>                                   reducing(City::getPop, Integer::sum));
>
>     Biggest city by name:
>     Comparator<City> bySize = Comparators.comparing(City::getPop);
>     Map<String, City> biggestCityByName
>       = cities.stream()
>               .collect(groupingBy(City::getName,
>                                   reducing(greaterOf(bySize)));
>
>
>
> On 3/20/2013 3:24 PM, Michael Nascimento wrote:
>> Hi guys,
>>
>> I had this before:
>>
>> Map<String, City> cityByName = cities.stream().collect(groupingReduce(
>> city -> city.getName(), throwingMerger()));
>>
>> What is the proper replacement?
>>
>> Regards,
>> Michael
>>
>