In HyperSeq§
See primary documentation in context for method invert
method invert(HyperSeq:)
Inverts the HyperSeq
created from a Seq
by .hyper
.
In RaceSeq§
See primary documentation in context for method invert
method invert(RaceSeq:)
Inverts the RaceSeq
created from a Seq
by .race
.
In Map§
See primary documentation in context for method invert
method invert(Map: --> Seq)
Returns all keys and their respective values as a Seq
of Pair
s where the keys and values have been exchanged. The difference between invert
and antipairs
is that invert
expands list values into multiple pairs.
my = Map.new('a' => (2, 3), 'b' => 17);say .invert; # OUTPUT: «(2 => a 3 => a 17 => b)»
In List§
See primary documentation in context for routine invert
method invert(List: --> Seq)
Assumes every element of the List is a Pair
. Returns all elements as a Seq
of Pair
s where the keys and values have been exchanged. If the value of a Pair
is an Iterable
, then it will expand the values of that Iterable
into separate pairs.
my = List.new('a' => (2, 3), 'b' => 17);say .invert; # OUTPUT: «(2 => a 3 => a 17 => b)»
In role Baggy§
See primary documentation in context for method invert
method invert(Baggy: --> Seq)
Returns all elements and their respective weights as a Seq
of Pair
s, where the element itself is the value and the weight of that element is the key, i.e. the opposite of method pairs. Except for some esoteric cases, invert
on a Baggy type returns the same result as antipairs.
my = bag <bacon eggs bacon>;my = .invert;say .sort; # OUTPUT: «(1 => eggs 2 => bacon)»
In Any§
See primary documentation in context for method invert
multi method invert(Any:)multi method invert(Any:)
Applied to a type object will return an empty list; applied to an object will convert it to a list and apply List.invert
to it, that is, interchange key with value in every Pair. The resulting list needs to be a list of Pair
s.
"aaabbcccc".comb.Bag.invert.say; # OUTPUT: «(4 => c 3 => a 2 => b)»
In this case, a Bag
can be converted to a list of Pair
s. If the result of converting the object to a list is not a list of pairs, the method will fail.
In Pair§
See primary documentation in context for method invert
method invert(Pair: --> Seq)
Returns a Seq
. If the .value
of the invocant is NOT an Iterable
, the Seq
will contain a single Pair
whose .key
is the .value
of the invocant and whose .value
is the .key
of the invocant:
:foo<bar>.invert.raku.say; # OUTPUT: «(:bar("foo"),).Seq»
If invocant's .value
is an Iterable
, the returned Seq
will contain the same number of Pair
s as items in the .value
, with each of those items a .key
of a pair and the .key
of the invocant the .value
of that pair:
:foo<Raku is great>.invert.raku.say;# OUTPUT: «(:Raku("foo"), :is("foo"), :great("foo")).Seq»:foo.invert.raku.say;# OUTPUT: «((:a(42)) => "foo", (:b(72)) => "foo").Seq»
To perform the exact .key
and .value
swap, use .antipair
method.