jed at 59A2.org
Sat Dec 8 15:27:08 EST 2007
On 8 Dec 2007, ryanbloor at hotmail.com wrote:
> Function A is a function that passes its input into B
> Function B is a function that does something once.
> How do I make it so function A is done multiple times without adding a
> third function?
By this, do you mean that you have functions f, g
f :: a -> a
g :: a -> b
and you want
b . f . f . f . ... . f
where there are n applications of f? If so, then
g . (!! n) . iterate f
will do the trick. Alternatively, you can produce the infinite list, as
map (^2) . iterate succ $ 0 -- [0,1,4,9,16,25,36,49,64,81 ...
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