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Re^14: Near-free function currying in Perl

by TimToady (Parson)
on Nov 20, 2004 at 17:41 UTC ( #409269=note: print w/replies, xml ) Need Help??

in reply to Re^13: Near-free function currying in Perl
in thread Near-free function currying in Perl

Currying in Perl 6 is not about saving keystrokes. It's about preserving abstraction, in the sense of letting you factor out those parts of an interface you're not interested in. For that reason, I expect curried modules and classes to be more heavily used than curried functions.

It's also a bit of future proofing. I can pull in a module or function and use it all over the place in my program. Then suppose the author of that module or function decides to add an additional optional parameter that happens to default the "wrong" way. I can override that bad default with a single curry, even if they added that bad parameter to every function in the module.

But we're not going to do implicit currying because we don't want the return type of a function to magically change just because someone tweaked the interface with an optional parameter or generalized one of the parameter types.

Doubtless there will be a way to implement implicit currying if you really want it, but it won't be the default.

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Re^15: Near-free function currying in Perl
by BrowserUk (Pope) on Nov 20, 2004 at 18:19 UTC

    Thanks. There are at least two, if not three, good uses for currying in a non-FP language in there.

    And, FWIW, I really like the name .assuming for the triggering method.

    As always when you step in a with such enlightenments, my brain goes into immediate overdrive thinking about the possibilities.

    Examine what is said, not who speaks.
    "But you should never overestimate the ingenuity of the sceptics to come up with a counter-argument." -Myles Allen
    "Think for yourself!" - Abigail        "Time is a poor substitute for thought"--theorbtwo         "Efficiency is intelligent laziness." -David Dunham
    "Memory, processor, disk in that order on the hardware side. Algorithm, algorithm, algorithm on the code side." - tachyon

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