Hi, I am curious to know if there is a function in Haskell to find if a certain value has already been evaluated. The function I need would have the type:
> (?!) :: a -> Bool And I expect it to be such that the following terminates after printing the first 101 fibonacci numbers. > fibs = 0 : 1 : zipWith (+) fibs (tail fibs) > > main = do print $ fibs !! 100 > print $ takeWhile (?!) fibs Although I guess I can imagine the following not terminating: > print $ filter (?!) fibs I would find such a function immensely useful in "printing out" my infinite lists. Thanks! nikhil _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
