Perl 6 Documentationroutine succ
Documentation for routine succ assembled from the following types:
class Numeric
From Numeric
(Numeric) method succ
method succ(Numeric:)
Returns the number incremented by one (successor).
enum Bool
From Bool
(Bool) routine succ
method succ(--> Bool)
Returns True.
say True.succ; # OUTPUT: «True»say False.succ; # OUTPUT: «True»
succ is short for "successor"; it returns the next enum value. Bool is a special enum with only two values, False and True. When sorted, False comes first, so True is its successor. And since True is the "highest" Bool enum value, its own successor is also True.
role Enumeration
From Enumeration
(Enumeration) method succ
Defined as:
method succ(::?CLASS:)
say Oðin.succ; # OUTPUT: «Freija»
class Date
From Date
(Date) method succ
Defined as:
method succ(Date: --> Date)
Returns a Date of the following day. "succ" is short for "successor".
say Date.new("2016-02-28").succ; # OUTPUT: «2016-02-29»
class Str
From Str
(Str) method succ
method succ(Str --> Str)
Returns the string incremented by one.
String increment is "magical". It searches for the last alphanumeric sequence that is not preceded by a dot, and increments it.
'12.34'.succ; # RESULT: «13.34»'img001.png'.succ; # RESULT: «img002.png»
The actual increment step works by mapping the last alphanumeric character to a character range it belongs to, and choosing the next character in that range, carrying to the previous letter on overflow.
'aa'.succ; # RESULT: «ab»'az'.succ; # RESULT: «ba»'109'.succ; # RESULT: «110»'α'.succ; # RESULT: «β»'a9'.succ; # RESULT: «b0»
String increment is Unicode-aware, and generally works for scripts where a character can be uniquely classified as belonging to one range of characters.
class IO::Path
From IO::Path
(IO::Path) method succ
Defined as:
method succ(IO::Path: --> IO::Path)
Returns a new IO::Path constructed from the invocant, with .basename changed by calling Str.succ on it.
"foo/file02.txt".IO.succ.say; # OUTPUT: «"foo/file03.txt".IO»