On Sun, May 20, 2012 at 8:42 AM, Stuart Hungerford
<stuart.hungerford@gmail.com> wrote:
Hi,
This is kind-of related to my earlier question on looking up functions
by name. Suppose I have a module with a number of functions with the
same signature:
scale :: Int -> Int -> Int
scale s x = s * x
add :: Int -> Int -> Int
add a x = a + x
...
I'd like to choose and run one of these functions randomly at run
time. I can see I could use some kind of case expression:
op :: Int -> Int -> Int
op p x = case random(1,2) of
1 -> scale p x
2 -> add p x
Or some kind of pattern guards:
op p x
| random(1,2) == 1 = scale p x
| otherwise = add p x
Although that method won't work as is for more than two choices. Are
these methods the most idiomatic way of randomly choosing a function?
How hard would it be to use the machinery of the QuickCheck library
for this, given it must be doing something similar in test suites?
Thanks,
Stu
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