http://www.perlmonks.org?node_id=598112


in reply to Re^2: -pi -e argv repeater
in thread -pi -e argv repeater

It's a prototype.

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

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

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Re^4: -pi -e argv repeater
by OfficeLinebacker (Chaplain) on Feb 04, 2007 at 17:13 UTC
    Ikegami,
    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.
[reply]

      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.
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      I can't comment until I know to what you are referring. What is on those pages?
[reply]
      Ikegami:

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

      Browser:

      What prior justifictions are there?

      I like computer programming because it's like Legos for the mind.
[reply]
        I avoid prototypes unless they are required. As stated in the post to which you replied, pie { CODE } SCALAR, LIST would not work without the prototype.
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