Substitute for groupingReduce ?

[Brian Goetz]

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
>