Re: Hello World for module writers

[2teez]

Hi,

"I am trying to produce a Perl module. "Hello World" is escaping me..." HOW?
"... if there was a Hello::World module..."

Really, why would anyone want to write "Hello, World" as a module?
When such task can be achieved in a one-liner as shown previously. However, who knows? To the longings of the heart, who can tell?
Below is a head up.
If you want to produce a module Hello::World, create a folder called Hello, and then inside the folder make a perl module named "World.pm". ( In my case, I have two namely: "World.pm" and "World2.pm" )
Hello/World.pm contains the following lines:

package Hello::World;
use warnings;
use strict;
use Exporter;

our @ISA    = qw(Exporter);
our @EXPORT = qw(greetings);

sub greetings {
    return "Hello, World";
}

1;

You can even decide to go the OOP way like so:
Hello/World2.pm contains the following lines:

package Hello::World2;
use warnings;
use strict;

sub new {
    my $class = shift;
    my $self = { greeting => shift, };
    return bless $self, $class;
}

sub the_greetings {
    my $self = shift;
    return $self->{greeting};
}

1;

Make another perl file, say "hello.pl", then use Hello::World therein like so:

#!/usr/bin/perl
use warnings;
use strict;
use Hello::World;
use Hello::World2;  ## OOP

print greetings();  ## prints Hello, World

print $/;

my $greet = Hello::World2->new("Hello, World, Again");
print $greet->the_greetings();  ## prints Hello, World, Again

You can get more info. from perlmod, perlmodlib and several other books and tutorials onlines.
I can only hope this turn on the bulb!:)