raku-rosettacode/programming_tasks/C/Check_that_file_exists.md

Check that file exists

 
my $path = "/etc/passwd";
say $path.IO.e ?? "Exists" !! "Does not exist";
 
given $path.IO {
    when :d { say "$path is a directory"; }
    when :f { say "$path is a regular file"; }
    when :e { say "$path is neither a directory nor a file, but it does exist"; }
    default { say "$path does not exist" }
}
 
 

when internally uses the smart match operator ~~, so when :e really does $given ~~ :e instead of the method call $given.e; both test whether the file exists.

 
run ('touch', "♥ Unicode.txt");
 
say "♥ Unicode.txt".IO.e;      # "True"
say "♥ Unicode.txt".IO ~~ :e;  # same