Hi Mike,
On Thu, 24 Nov 2011 23:28:39 -0500
Mike D <[email protected]> wrote:
> Hi all, just started using Perl today, coming over from a background in
> C#/Java and Python.
Welcome to Perl.
>
> I seem to be grasping Perl rather nicely (I think) until I got up to
> references in Beginning Perl.
>
> Considering the following code, are all my comments correct?
Yes, all your comments appear to be correct.
>
> # this function expects an array to be passed by reference
> sub foo
> {
> my ($thing1) = @_; # make a lexical variable for the array being passed
> for (@$thing1) # to access the whole array after referencing
> {
> print $_."\n";
> }
> print $thing1->[0]."\n"; # access single element in referenced array
> }
>
> my @array = (1,2,3,4);
>
> foo(\@array); # pass @array by reference to sub foo
>
>
> It's pretty confusing, especially since BP uses prototypes during the
> example, which I'm told are bad? Never use them?
Yes, in general, you shouldn't add prototypes to your subroutines.
For more information about references, see the various resources on:
http://perl-begin.org/topics/references/
You may also be interested in this page -
http://perl-begin.org/tutorials/bad-elements/ , or in the book Modern Perl by
chromatic ( http://perl-begin.org/tutorials/modern-perl/ ) which is intended
for already experienced programmers.
Regards,
Shlomi Fish
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