wb:
Hello to everyone!
Two days ago I have found Haskell in Internet. It sounds very nice. I have read some articles, few examples, ... yes it sounds nice.
Great! Welcome to Haskell.
Now my problem is connected with the "non-update" object feature. I can't write "variable" instead object because - from the meaning of the word ( variable ) - it has the possibility to CHANGE its value. Yes that my problem :-(
It's not a problem :)
Let's assume that I've got to write the application that should works as follows:
1. At the beginning the user should write her/his name (for instance as the application parameter). 2. Let's assume that the application has many various functions defined inside, and - after printing each of the outputs - the name has to be printout.
How should I think "properly" in Haskell to get described action?
Forget about updating values in place: its not necessary, and makes your programs more flexible, and simpler to understand. Here's a short program to read a user's name, and then apply various functions to that name, printing the result. import System.IO import Data.Char import System.Console.Readline main = do name <- do m <- readline "What is your name> " return (maybe "Nobody" id m) print (reverse name) print (length name) let n = map ord name print n print (sum n) print name We can run this: $ runhaskell A.hs What is your name> lambdaman "namadbmal" 9 [108,97,109,98,100,97,109,97,110] 925 "lambdaman" Just dive in (start on http://haskell.org). -- Don