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Re^2: -pi -e argv repeater

by OfficeLinebacker (Chaplain)
on Feb 03, 2007 at 19:08 UTC ( #598110=note: print w/replies, xml ) Need Help??

in reply to Re: -pi -e argv repeater
in thread -pi -e argv repeater

May I ask what the (&$@) in the sub declaration is for?

I like computer programming because it's like Legos for the mind.

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Re^3: -pi -e argv repeater
by ikegami (Pope) on Feb 03, 2007 at 19:14 UTC

    It's a prototype.

    Without the prototype, you'd have to do
    pie sub { CODE }, SCALAR, LIST
    pie &func, SCALAR, LIST

    With the prototype, you can also do
    pie { CODE } SCALAR, LIST

      I see you disagree with Damian Conway (as expressed in Perl Best Practices--pp 194-196 for those of you following from home). I wish I understood better the exact thought processes behind each of your approaches.

      Either way, yes, $^I is the way to go (or, if you really want to be a Boy Scout about it, use English, only without the evil regexp vars, and use $INPLACE_EDIT in place of $^I).

      I like computer programming because it's like Legos for the mind.

        Another justifiction: $INPLACE_EDIT is "clearer" that $^I.

        If you don't understand the process set in motion by setting an appropriate value into this magic variable, via either alias; and what constitutes an 'appropriate value'; and what other pieces of magical context are required to make it all work; then you are going to have to look it up. And it is just as easy to look up $^I as it is to lookup $INPLACE_EDIT.

        And if you are familiar with the requirements and effect of setting a value into that magic variable, then $INPLACE_EDIT is no clearer than $^I.

        The former is in no way enough to explain what's going on, if you are unfamiliar with the operation.

        Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
        "Science is about questioning the status quo. Questioning authority".
        In the absence of evidence, opinion is indistinguishable from prejudice.
        I can't comment until I know to what you are referring. What is on those pages?

        Basically Damian says never prototype subs. I don't know how much I can type in here without violating copyright.


        What prior justifictions are there?

        I like computer programming because it's like Legos for the mind.

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