From type/Baggy

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method keys(Baggy:D: --> Seq:D)

Returns a Seq of all keys in the Baggy object without taking their individual weights into account as opposed to kxxv.

my $breakfast = bag <eggs spam spam spam>;
say $breakfast.keys.sort;                        # OUTPUT: «(eggs spam)␤» 
 
my $n = ("a" => 5, "b" => 2).BagHash;
say $n.keys.sort;                                # OUTPUT: «(a b)␤»

From type/Any

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multi method keys(Any:U: --> List)
multi method keys(Any:D: --> List)

For defined Any returns its keys after calling list on it, otherwise calls list and returns it.

my $setty = Set(<Þor Oðin Freija>);
say $setty.keys; # OUTPUT: «(Þor Oðin Freija)␤»

See also List.keys.

Trying the same on a class will return an empty list, since most of them don't really have keys.

From type/Setty

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multi method keys(Setty:D: --> Seq:D)

Returns a Seq of all elements of the set.

my $s = Set.new(1, 2, 3);
say $s.keys;                                      # OUTPUT: «(3 1 2)␤»

From type/Map

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method keys(Map:D: --> Seq:D)

Returns a Seq of all keys in the Map.

my $m = Map.new('a' => (2, 3), 'b' => 17);
say $m.keys; # OUTPUT: «(a b)␤»

From type/Capture

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multi method keys(Capture:D: --> Seq:D)

Returns a Seq containing all positional keys followed by all named keys. For positional arguments the keys are the respective arguments ordinal position starting from zero.

my $capture = \(2, 3, 5, apples => (red => 2));
say $capture.keys; # OUTPUT: «(0 1 2 apples)␤»

From type/Pair

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multi method keys(Pair:D: --> List:D)

Returns a List containing the key of the invocant.

say (Raku => "d").keys;                           # OUTPUT: «(Raku)␤»

From type/List

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sub    keys($list --> Seq:D)
method keys(List:D: --> Seq:D)

Returns a sequence of indexes into the list (e.g., 0..(@list.elems-1)).

say (1,2,3,4).keys; # OUTPUT: «0..3␤»