劉康民 > Rubyish > Rubyish::Syntax::nil

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NAME ^

Rubyish::Syntax::nil - Gives you a nil object.

SYNOPSIS ^

    use Rubyish::Syntax::nil;

    my $a = nil;

    # Methods of nil
    my $empty_array  = nil->to_a;
    my $empty_string = nil->to_s;
    my $zero   = nil->to_i;
    my $zero_f = nil->to_f;

DESCRIPTION ^

This module exports a nil bareword that works almost like Ruby nil. It represents the singleton object of Rubyish::NilClass. It means false under boolean context, 0 when being numerified, "" when stringified, [] when converted to an array.

It also keep the behaviour that nil always referes to the same, singleton object whenever it's used in the program.

METHODS ^

The nil object has following instance methods:

nil

Always returns a true value.

to_a

Always returns an empty Rubyish::Array.

to_f

Always returns 0.0.

to_i

Always returns 0.

to_s

Always returns an empty Rubyish::String.

SEE ALSO ^

Rubyish::NilClass for the implementation of these methods.

AUTHOR ^

Kang-min Liu <gugod@gugod.org>, shelling shelling@cpan.org

LICENCE AND COPYRIGHT ^

Copyright (c) 2008,2009, Kang-min Liu <gugod@gugod.org>.

This is free software, licensed under:

    The MIT (X11) License

DISCLAIMER OF WARRANTY ^

BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.

IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

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