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is-absolute
Combined from primary sources listed below.

In IO::Spec::Win32§

See primary documentation in context for method is-absolute 

method is-absolute(Str:D $path --> Bool:D)

Returns True if the $path starts with a slash ("/") or backslash ("\"), even if they have combining character on them, optionally preceded by a volume:

say IO::Spec::Win32.is-absolute: "/foo";        # OUTPUT: «True␤» 
say IO::Spec::Win32.is-absolute: "/\x[308]foo"; # OUTPUT: «True␤» 
say IO::Spec::Win32.is-absolute: ｢C:\foo｣;      # OUTPUT: «True␤» 
say IO::Spec::Win32.is-absolute: "bar";         # OUTPUT: «False␤»

In IO::Spec::Cygwin§

See primary documentation in context for method is-absolute 

method is-absolute(Str:D $path --> Bool:D)

Returns True if the $path starts with a slash ("/") or backslash ("\"), even if they have combining character on them, optionally preceded by a volume:

say IO::Spec::Cygwin.is-absolute: "/foo";        # OUTPUT: «True␤» 
say IO::Spec::Cygwin.is-absolute: "/\x[308]foo"; # OUTPUT: «True␤» 
say IO::Spec::Cygwin.is-absolute: ｢C:\foo｣;      # OUTPUT: «True␤» 
say IO::Spec::Cygwin.is-absolute: "bar";         # OUTPUT: «False␤»

In IO::Spec::Unix§

See primary documentation in context for method is-absolute 

method is-absolute(Str:D $path --> Bool:D)

Returns True if the $path starts with a slash ("/"), even if it has combining character on it:

say IO::Spec::Unix.is-absolute: "/foo";        # OUTPUT: «True␤» 
say IO::Spec::Unix.is-absolute: "/\x[308]foo"; # OUTPUT: «True␤» 
say IO::Spec::Unix.is-absolute: "bar";         # OUTPUT: «False␤»

In IO::Path§

See primary documentation in context for method is-absolute 

method is-absolute(IO::Path:D: --> Bool)

Returns True if the path is an absolute path, and False otherwise.

"/foo".IO.is-absolute.say; # OUTPUT: «True␤» 
"bars".IO.is-absolute.say; # OUTPUT: «False␤»

Note that on Windows a path that starts with a slash or backslash is still considered absolute even if no volume was given, as it is absolute for that particular volume:

IO::Path::Win32.new("/foo"  ).is-absolute.say; # OUTPUT: «True␤» 
IO::Path::Win32.new("C:/foo").is-absolute.say; # OUTPUT: «True␤» 
IO::Path::Win32.new("C:foo" ).is-absolute.say; # OUTPUT: «False␤»