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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

values array codepoint := ["A", "1", "b", "?", "X", "4"]
classify (c codepoint) String => c.is_ascii_letter ? "letter" : c.is_ascii_digit ? "digit" : "other"
values.group_map_reduce String i32 classify (_->1) (+)
 
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=> {(digit => 2), (letter => 3), (other => 1)}

Type Parameters

type of the keys
type of the values in the result
0.094dev (2025-07-10 15:41:47 GIT hash eafa42ae743de61b62f958948d7abb5fada7756f built by fridi@fzen)