all tasks

Task/Time-a-function/Haskell/time-a-function.hs

@@ -0,0 +1,13 @@
+import System.CPUTime
+
+-- We assume the function we are timing is an IO monad computation
+timeIt :: (Fractional c) => (a -> IO b) -> a -> IO c
+timeIt action arg =
+  do startTime <- getCPUTime
+     action arg
+     finishTime <- getCPUTime
+     return $ fromIntegral (finishTime - startTime) / 1000000000000
+
+-- Version for use with evaluating regular non-monadic functions
+timeIt' :: (Fractional c) => (a -> b) -> a -> IO c
+timeIt' f = timeIt (\x -> f x `seq` return ())