Yes, and yes :)
For example:
import Data.Char
main = do
let prompt s = do
putStrLn s
getLine
firstName <- prompt "What's your first name?"
lastName <- prompt "What's your last name?"
let bigFirstName = map toUpper firstName
bigLastName = map toUpper lastName
putStrLn $ "hey " ++ bigFirstName ++ " " ++ bigLastName ++ ", how are
you?"
- Job
On Tue, Aug 10, 2010 at 12:40 PM, michael rice <[email protected]> wrote:
>
> From: Learn You a Haskell
>
> ===================
>
> Remember let bindings? If you don't, refresh your memory on them by reading
> this section. They have to be in the form of let bindings in expression,
> where bindings are names to be given to expressions and expression is the
> expression that is to be evaluated that sees them. We also said that in list
> comprehensions, the in part isn't needed. Well, you can use them in do
> blocks pretty much like you use them in list comprehensions. Check this out:
>
>
> import Data.Char
>
> main = do
> putStrLn "What's your first name?"
> firstName <- getLine
> putStrLn "What's your last name?"
> lastName <- getLine
> let bigFirstName = map toUpper firstName
> bigLastName = map toUpper lastName
> putStrLn $ "hey " ++ bigFirstName ++ " " ++ bigLastName ++ ", how are
> you?"
>
> ===================
>
> Questions:
>
> 1) Is there an implicit *in* before the last line above?
>
> 2) Within a do "in" the IO monad (or any other monad), can a *let* do
> something like this?
>
> let x = do -- in a different monad
>
>
> Michael
>
>
>
> _______________________________________________
> Haskell-Cafe mailing list
> [email protected]
> http://www.haskell.org/mailman/listinfo/haskell-cafe
>
>
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