Re: [Haskell-cafe] Re: Tutorial uploaded

21 Dec 2005

      On Wednesday 21 December 2005 16:49, Sebastian Sylvan wrote:
...
On 12/21/05, Daniel Carrera  wrote:
...
Sebastian Sylvan wrote:
...
Beginners know that too. In fact, they often think that practical
applications need far more IO than they really do! So to
insinuate even slightly that Haskell is "bad at IO" by avoiding
it for two thirds of a book, is really going to inforce the idea
that Haskell isn't a practical language for practical
applications.
It's easily remedied by teaching them a little IO up front (to
show them it's not scary), and then leaving it alone for a while,
having a more thorugough treatment of it later on.
You can show them this on the first page:
main = do
        x <- getLine()
        print my_program(x)
Well, more like
main = do x <- getLine
               print (my_program x)
This:

main = do
        x <- getLine
        print (my_program x)

would be correct too. (Just to make it clear that the main point was not 
the different layout but the parentheses: Haskell uses them only to 
indicate precedence, they are not required around function arguments.)

Ben

Re: [Haskell-cafe] Re: Tutorial uploaded

Benjamin Franksen