lib.lists.groupBy

Takes 2 arguments

f, list

Groups elements of list together by the string returned from the function f called on each element. It returns an attribute set where each attribute value contains the elements of list that are mapped to the same corresponding attribute name returned by f.

For example,

builtins.groupBy (builtins.substring 0 1) ["foo" "bar" "baz"]

evaluates to

{ b = [ "bar" "baz" ]; f = [ "foo" ]; }

Noogle detected

• builtins.groupBy
• lib.groupBy

groupBy :: (a -> b) -> [a] -> AttrSet