Hello there,
name's Frank-Andre Riess. Nice to meet you m(_ _)m
Welcome.
So, well, my first question on this list is admittedly somewhat simple, but I
managed to delay it long enough and now I think I should ask about it: Does
($) have any relevance at all except for being a somewhat handier version of
parentheses?
That's mostly how it is used (although some will say that it is a
terrible idea), but one can also do some pretty neat tricks with it as a
higher-order function. Eg,
zipWith ($)
Is a function which takes a list of functions and a list of arguments
and applies the functions pairwise with the arguments. In addition,
because of the way the zip* functions work, you can create an infinite
cycle of functions to apply to some arguments as in:
zipWith ($) (cycle [sin,cos]) [1..5]
which is equivalent to:
[sin 1,cos 2,sin 3,cos 4,sin 5]
I'm sure there are other more esoteric things, but this is about as
complex as I try to go to avoid severe headaches :)
Robert Dockins
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