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Re^11: Near-free function currying in Perlby BrowserUk (Pope)
|on Nov 18, 2004 at 20:55 UTC||Need Help??|
map and grep are the same way -- at first, they look like inscrutable shorthand for a two- or three-statement for loop...
I've still to see an example of when I might want to use this in Perl?
Tom kinda dismissed this, as my not being familar with the concept, so therefore I could see the opportunities, but I think he is wrong.
So far in this thread, I haven't seen anyone else come up with a good, everyday example of where currying would have done something useful.
I spent a good part of the last few days going through some of the 8000+ small scripts in my test directory looking for places where I might have used this. So far, not a single one.
Every place where I call a sub with constant value parameters in the first one or two positional arguments, the functions are in a loop so I only needed to type it once anyway.
All currying would have done in these situations is add an extra two (_c) or more characters to type in-line, plus the use Autocurry qw[ :all ] plus have to worry about making sure that I positioned that use line appropriately so that only the subs I wanted curried would follow it.
Every way I look at this, currying (or Autocurrying) buys me nothing. I have to type more. My code runs more slowly.
And with autocurrying, I have an extra administrative task of ensuring that the sequence and position of use lines relative to each other, and to my sub definitions is correct.
Normally, my use lines go at the top of the program in whatever order I realise I need them. Except when using threads when I have to be somewhat more careful to conserve space.
And I know exactly what a pain it is having to think about that, so the idea of having another set of position dependancies to worry about is a total anathema to me.
That maybe a part of the problem. Haskell programs have an entirely different structure to Perl programs.
Nope. No matter how hard I try, I cannot see any merit in currying, and especially not Autocurrying in Perl (5). None at all. I can never envisage it becoming anything beyond a mildly interesting curiosity.
In Perl 6, if the overhead of sub calls is less, and the syntax built in and more condusive to it's use, maybe it will become more prevalent, but I still don't see it ever becoming common, nevermind ubiquitous.
Time will tell :)
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