What is the best way to split a string by a delimiter functionally?

Question

I tried to write the program in Haskell that will take a string of integer numbers delimitated by comma, convert it to list of integer numbers and increment each number by 1

Answer 1

Just for fun, here is how you could create a simple parser with Parsec:

module Main where

import Control.Applicative hiding (many)
import Text.Parsec
import Text.Parsec.String

line :: Parser [Int]
line = number `sepBy` (char ',' *> spaces)

number = read <$> many digit

One advantage is that it's easily create a parser which is flexible in what it will accept:

*Main Text.Parsec Text.Parsec.Token> :load "/home/mikste/programming/Temp.hs"
[1 of 1] Compiling Main             ( /home/mikste/programming/Temp.hs, interpreted )
Ok, modules loaded: Main.
*Main Text.Parsec Text.Parsec.Token> parse line "" "1, 2, 3"
Right [1,2,3]
*Main Text.Parsec Text.Parsec.Token> parse line "" "10,2703,   5, 3"
Right [10,2703,5,3]
*Main Text.Parsec Text.Parsec.Token>