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RE: Re: Can perl do...?

by nashdj (Friar)
on Jun 05, 2000 at 15:56 UTC ( #16386=note: print w/replies, xml ) Need Help??

in reply to Re: Can perl do...?
in thread Can perl do...?

There is still one thing beyond me. What about.. $foo; What purpose does it serve being able to do that. As I said before all I can think it would be good for is as a return for a sub. (I really need to get some books dont I)
I'm just curious :)

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RE: RE: Re: Can perl do...?
by athomason (Curate) on Jun 05, 2000 at 23:17 UTC
    That doesn't do anything at all; you're introducing a value into a null context. That is, your statement has no effect whatsoever since there are no side effects. For instance, try the one-liner perl -we "$_;"Using the -w flag will let you know when your statements aren't doing anything.
      Ok, so if it does nothing, then why not in a future perl release allow that to assign the value to $_. Sure it might sound completely useless, but if it already is useless. I would find something like that very handy. As for making sense, it seems to do that too..
      It does one thing nashdj alluded to. As the last statement in a block, the resultant value of the block is the value in the variable.

      For example, in the Everything source they'll occasionally have a subroutine that does something like:

      sub do_thisorthat { my ($text, $op) = shift; my $code = get_op($op); $code->$text; # manipulate text $text; }

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