routine reverse

Documentation for routine reverse, assembled from the following types:

class Any

From Any

(Any) routine reverse

Defined as:

multi sub    reverse(*@list  --> Seq:D)
multi method reverse(List:D: --> Seq:D)

Returns a Seq with the same elements in reverse order.

Note that reverse always refers to reversing elements of a list; to reverse the characters in a string, use flip.

Examples:

say <hello world!>.reverse;     # OUTPUT: «(world! hello)␤» 
say reverse ^10;                # OUTPUT: «(9 8 7 6 5 4 3 2 1 0)␤» 

class List

From List

(List) routine reverse

Defined as:

multi sub    reverse(*@list  --> Seq:D)
multi method reverse(List:D: --> Seq:D)

Returns a Seq with the same elements in reverse order.

Note that reverse always refers to reversing elements of a list; to reverse the characters in a string, use flip.

Examples:

say <hello world!>.reverse;     # OUTPUT: «(world! hello)␤» 
say reverse ^10;                # OUTPUT: «(9 8 7 6 5 4 3 2 1 0)␤» 

role Blob

From Blob

(Blob) method reverse

Defined as:

method reverse(Blob:D: --> Blob:D)

Returns a Blob with all elements in reversed order.

say Blob.new([123]).reverse;    # OUTPUT: «Blob:0x<03 02 01>␤» 
say blob16.new([2]).reverse;        # OUTPUT: «Blob[uint16]:0x<02>␤» 
say buf32.new([1632]).reverse;    # OUTPUT: «Buf[uint32]:0x<20 10>␤» 

class Range

From Range

(Range) method reverse

method reverse(Range:D: --> Seq:D)

Returns a Seq where all elements that the Range represents have been reversed. Note that reversing an infinite Range won't produce any meaningful results.

say (1^..5).reverse;                              # OUTPUT: «(5 4 3 2)␤» 
say ('a'..'d').reverse;                           # OUTPUT: «(d c b a)␤» 
say (1..Inf).reverse;                             # OUTPUT: «(Inf Inf Inf ...)␤» 

class Supply

From Supply

(Supply) method reverse

method reverse(Supply:D: --> Supply:D)

Taps the Supply it is called on. Once that Supply emits done, all of the values it emitted will be emitted on the returned Supply in reverse order. If the original Supply quits, then the exception is immediately conveyed on the return Supply.

my $s = Supply.from-list(123);
my $t = $s.reverse;
$t.tap(&say);           # OUTPUT: «3␤2␤1␤»