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group_map_reduce

Sequence.group_map_reduce

group elements using key_f and
reduce elements within a group by first applying f and then using reduce_f to reduce

example: count occurrences of letters, numbers and other characters


=> {(digit => 2), (letter => 3), (other => 1)}

Type Parameters

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