• d-bugmail puremagic.com (35/35) Oct 10 2012 http://d.puremagic.com/issues/show_bug.cgi?id=8798

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8798

           Summary: Tuple curry example not really curry
           Product: D
           Version: D2
          Platform: All
               URL: http://dlang.org/tuple.html
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: websites
        AssignedTo: nobody puremagic.com
        ReportedBy: Jesse.K.Phillips+D gmail.com


--- Comment #0 from Jesse Phillips <Jesse.K.Phillips+D gmail.com> 2012-10-10
19:33:11 PDT ---
Per doc comment: http://www.prowiki.org/wiki4d/wiki.cgi?DocComments/Tuples

Actually they call it "partial function application"

Currying is something else often mistaken for partial evaluation.

Currying is treating a function of N args that returns Ret

    func: (Arg1,Arg2,Arg3) -> Ret

as a function that does partial application of arguments "to the max"

    func: Arg1 -> (Arg2 -> (Arg3 -> Ret))

That's a

   function that takes an Arg1 and returns
    (a function that takes an Arg2 and returns
       (a function that takes an Arg3 and returns a Ret))

So the call func a b c is treated as (((func a) b ) c) with currying. In ML for
instance, all functions are curried by default (but you can sort of override
the behavior by declaring your function to take a tuple as a single argument).
Python has a partial application library that was originally called 'curry'
until the functional folks shot it down as a misnomer. Now it's called
'partial'. Python Partial Function Application

http://www.python.org/dev/peps/pep-0309/

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