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group_reduce

Sequence.group_reduce

group elements using key_f and reduce elements within a group using reduce_f
in contrast to the more general version, values in the resulting map must have the same type as in the input

example: sum even and odd numbers individually

(0..10).group_reduce String (x -> x%%2 ? "even" : "odd") (+)

=> {(even => 30), (odd => 25)}

Type Parameters

type of the keys
0.095dev (2025-09-09 14:29:31 GIT hash 98644f8f651c2101a0730cfe31c5807993b7603b built by fridi@fzen)