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Re^2: Functional Programming & method rewriting

by SpanishInquisition (Pilgrim)
on Oct 29, 2004 at 00:15 UTC ( [id://403556]=note: print w/replies, xml ) Need Help??


in reply to Re: Functional Programming & method rewriting
in thread Functional Programming & method rewriting

Yep, that is an good refactoring of prefix_later. The double closure, yeah, that's overkill, I did it just because I could. Code debate on a "I'm just screwing around" thread? :) Ok, I'll bite...
Why type more than you need to?

This philosophy is one I don't agree with, especially when developing code you are going to have to go back and tweak later. While I hate typing way too much (java boilerplate and convention is disgusting), I do type VERY VERY fast. Many of my habits are those of pseudo-defensive programming. Even when I'm not writing "throw away" code, I don't let go of those habits easily. Why? I don't write much throw away code ... I tend to work on stuff that sticks around.

For instance (and this is just me), I *always* name my subroutine parameters and never use "shift" directly. Why? I'm being defensive because I usually want named parameters later. Every time I've done a quick shift in the middle of a block of code, I've had to go back and change it later. With @args, I might want to later replace that @args with ($gorp,$slug,@args) = shift() for instance. It leaves a place in the code to do that, and I only have to edit one line to make that change.

But I think after that double closure you can grill me all you want :) It's like climbing Mt. Everest ... "Why? Because It's There".

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Re^3: Functional Programming & method rewriting
by elusion (Curate) on Oct 29, 2004 at 03:16 UTC
    Why type more than you need to?
    This philosophy is one I don't agree with, especially when developing code you are going to have to go back and tweak later.
    You're right. And I asked the wrong question; or at least an incomplete one. What I meant to ask was: why type more when you're not gaining anything? Your code is more complex, it's partially duplicated, and it's not very readable. I consider myself a strong Perl programmer (and I realize that assumption can be a dangerous one to start with :-), and I had to sit for a minute before I could figure out what it was that you'd done.
    Every time I've done a quick shift in the middle of a block of code, I've had to go back and change it later. With @args, I might want to later replace that @args with ($gorp,$slug,@args) = shift() for instance. It leaves a place in the code to do that, and I only have to edit one line to make that change.
    Are you sure you don't mean my (@args) = @_;? shift only ever returns one element, so using it in list context is pointless: ($gorp,$slug,@args) = shift() doesn't do anything to $slug or @args.

    I don't mean to grill you. I just want to understand and give some (hopefully friendly) advice.

    Update: my 200th node! :-)
      My fault. Ok, so replace ($gorp, $slug, @args) = shift() with ($gorp,$slug) = @_ and you get what I meant, ah well. Please shoot me for only testing with functions taking a single parameter :)

      This stupid mistake of mine was related to me thinking @_ would be accidentally closed around the first block, which isn't true, because @_ is magic... (I was always using @_ before, so, umh, that's why it's odd).

        No it's not because @_ is magic (whatever that means) it's because @_ is localized. And a package Variable anyway.
        Closures only grab lexicals (my variables). @_ is a package variable (local variable).

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