lucky :: (Integral a) => a -> String
lucky 7 = "LUCKY NUMBER SEVEN!!!"
lucky x = "Sorry, you're out of luck, pal..."
ghci:
:load "/path/to/lucky.hs"
[1 of 1] Compiling Main ( /path/to/lucky.hs, interpreted )
Ok, modules loaded: Main.
*Main> lucky 7
"LUCKY NUMBER SEVEN!!!"
*Main> lucky 200
"Sorry, you're out of luck, pal..."
*Main>
I would suggest verifying my ghc installation or for any "funky" chars in the file.
Homero Cardoso de Almeida
On Thu, May 31, 2012 at 6:16 PM, Keshav Kini
<keshav.kini@gmail.com> wrote:
Stan Kulp <
stan_kulp@yahoo.com> writes:
> I have been working my way through "Learn You a Haskell for Greater Good" and
> am stumped when I get to the "Syntax in Functions - Pattern Matching" section.
>
> The book shows the following expression...
>
> ghci> lucky :: (Integral a) => a -> String
learnyouahaskell.com does not contain this text - it doesn't have the
"ghci> " at the beginning of the line. Besides what others have said in
response to your question, I would add that you should make sure to read
LYAH on the website if possible - other sources might be out of date, as
I think the author does update the website version from time to time.
.. _the section you mention:
http://learnyouahaskell.com/syntax-in-functions#pattern-matching
-Keshav