(.) . (.) . (.)
This is the function which composes a 1-argument function with a 3-argument function (and the pattern generalizes to n in the second functional argument). I sometimes itch to use the n=2 case, as in the following, but good sense usually gets the better of me:
(.<) = (.) . (.)
(this allows, for example, concat .< replicate).
One gets the impression of some odd kind of Morse code, or perhaps "smileys" / "emoticons" ...
The attached file gives some more detail and examples for the points-free fans.
-- Fritz
Comp.hs
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