On Sun, Apr 20, 2014 at 09:50:43PM +0000, Chapman, Anthony Sergio wrote:
Now it seems a bit peculiar to me that in your functions, you didn't define the input ie toPerc = printf "%.2f" . (*100) instead of toPerc number = printf "%.2f" . (*100)
This expression uses the composition operator (.) rather than using function application directly. Note that for any functions 'f' and 'g', 'f . g' is defined to be the function '\x -> f (g x)'. Thus writing toPerc = printf "%.2f" . (*100) just means toPerc = \x -> printf "%.2f" ((*100) x) Desugaring the operator section gives toPerc = \x -> printf "%.2f" (x * 100) and moving the lambda to become an argument of 'toPerc' gives toPerc x = printf "%.2f" (x * 100) which is now in a form probably more familiar to you. Tom