Haskell: Converting Int to String
An example based on Chuck's answer:
myIntToStr :: Int -> String
myIntToStr x
| x < 3 = show x ++ " is less than three"
| otherwise = "normal"
Note that without the show
the third line will not compile.
You can use show:
show 3
What I want to add is that the type signature of show is the following:
show :: a -> String
And can turn lots of values into string not only type Int
.
For example:
show [1,2,3]
Here is a reference:
https://hackage.haskell.org/package/base-4.14.1.0/docs/GHC-Show.html#v:show
The opposite of read
is show
.
Prelude> show 3
"3"
Prelude> read $ show 3 :: Int
3
Anyone who is just starting with Haskell and trying to print an Int, use:
module Lib
( someFunc
) where
someFunc :: IO ()
x = 123
someFunc = putStrLn (show x)