This is an automatically generated page and cannot be edited directly. Text in Composite pages, (URLs starting with 'routine' or 'syntax') can be edited by clicking on the link labeled 'in context', and editing the text there.

Exit this popup by pressing <Escape>, or clicking on X or on the background.

repeated
Combined from primary sources listed below.

In Any§

See primary documentation in context for method repeated 

multi method repeated()
multi method repeated( :&as!, :&with! )
multi method repeated( :&as! )
multi method repeated( :&with! )

Similarly to unique, finds repeated elements in values (as a routine) or in the object, using the :as associative argument as a normalizing function and :with as equality function.

<1 -1 2 -2 3>.repeated(:as(&abs),:with(&[==])).say; # OUTPUT: «(-1 -2)␤»
(3+3i, 3+2i, 2+1i).repeated(as => *.re).say;        # OUTPUT: «(3+2i)␤»

It returns the last repeated element before normalization, as shown in the example above. See repeated for more examples that use its sub form.

In Supply§

See primary documentation in context for method repeated 

method repeated(Supply:D: :&as, :&with)

Creates a supply that only provides repeated values, as defined by the optional :as and :with parameters (same as with unique).

my $supply = Supply.from-list(<a A B b c b C>).repeated(:as(&lc));
$supply.tap(&say);           # OUTPUT: «A␤b␤b␤C␤»

See repeated for more examples that use its sub form.

Note: Available since version 6.e (Rakudo 2020.01 and later).

In Independent routines§

See primary documentation in context for routine repeated 

multi repeated(+values, |c)

This returns a sequence of repeated values from the invocant/argument list. It takes the same parameters as unique, but instead of passing through any elements when they're first seen, they're only passed through as soon as they're seen for the second time (or more).

Examples:

say <a a b b b c c>.repeated;                   # OUTPUT: «(a b b c)␤»
say <a b b c c b a>.repeated;                   # OUTPUT: «(b c b a)␤»
say <a A B b c b C>.repeated(:as(&lc));         # OUTPUT: «(A b b C)␤»

my @list = %(a => 42), %(b => 13), %(a => 42);
say @list.repeated(:with(&[eqv]))               # OUTPUT: «({a => 42})␤»

As in the case of unique the associative argument :as takes a Callable that normalizes the element before comparison, and :with takes a the equality comparison function that is going to be used.