Jon Harrop <jon@jdh30.plus.com> writes:

>> My question is: are there functions of level >= 2 used in practice
>> (e.g. (('a -> 'b -> 'a) -> 'a -> 'b list -> 'a) -> 'c)?
>
> I've just had a look through some real programs that I've written and the 
> answer is definitely yes. I use them quite a lot. For >2 they are mainly 3, 
> sometimes 4 and I haven't seen any >4.

http://citeseer.ist.psu.edu/okasaki99functional.html

-- 
   __("<         Marcin Kowalczyk
   \__/       qrczak@knm.org.pl
    ^^     http://qrnik.knm.org.pl/~qrczak/

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