NAME

Raku port of Perl's chr() / ord() built-ins

SYNOPSIS

use P5chr; # exports chr() and ord()

my $a = 65;
say chr $a;

my $a = "A";
say ord $a;

DESCRIPTION

This module tries to mimic the behaviour of Perl's chr and ord built-ins as closely as possible in the Raku Programmming Language.

ORIGINAL PERL 5 DOCUMENTATION

chr NUMBER
chr     Returns the character represented by that NUMBER in the character
        set. For example, "chr(65)" is "A" in either ASCII or Unicode, and
        chr(0x263a) is a Unicode smiley face.

        Negative values give the Unicode replacement character
        (chr(0xfffd)), except under the bytes pragma, where the low eight
        bits of the value (truncated to an integer) are used.

        If NUMBER is omitted, uses $_.

        For the reverse, use "ord".

        Note that characters from 128 to 255 (inclusive) are by default
        internally not encoded as UTF-8 for backward compatibility
        reasons.

ord EXPR
ord     Returns the numeric value of the first character of EXPR. If EXPR
        is an empty string, returns 0. If EXPR is omitted, uses $_. (Note
        character, not byte.)

        For the reverse, see "chr".

PORTING CAVEATS

With the arrival of RakuAST, it has become impossible to access the topic variable ($_) of the caller's scope. So Perl's idiom of calling chr or ord has become impossible. Code such as:

say chr;

should be changed to either:

say chr($_);

or, using the subroutine as a method syntax, with the prefix . shortcut to use that scope's $_ as the invocant:

say .&chr;

By the way, the Raku built-ins chr and ord subroutines have almost the same semantics as their Perl counterparts (apart from the topic from caller feature, which no longer works). So in most cases it should not be needed to be using this module at all anymore.

AUTHOR

Elizabeth Mattijsen liz@raku.rocks

Source can be located at: https://github.com/lizmat/P5chr . Comments and Pull Requests are welcome.

If you like this module, or what I'm doing more generally, committing to a small sponsorship would mean a great deal to me!

COPYRIGHT AND LICENSE

Re-imagined from Perl as part of the CPAN Butterfly Plan.

This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.