Convert String Value to Byte Value in Haskell

In Haskell, we will convert String Value to Byte value by using ord , B.pack and fromNum functions. In the first example, we are going to use (stringToBytes = map ord ) function and in the second example, we are going to call (stringToBytes = B.pack) function. And in the third example, we are going to use (byteList = map fromEnum str) function.

Algorithm

• Step 1 ? The Data.Char module is imported.

• Step 2 ? The stringToBytes function is defined using ord function as,

• Step 3 ? The program execution will be started from main function. The main() function has whole control of the program. It is written as main = do.

• Step 4 ? The variable named, ?str' is defined that will hold the String that is to be converted to byte.

• Step 5 ? The resultant byte value corresponding to the string value is printed to the console, once the function is being called.

Example 1

In this example, string value is converted to byte value using ord function.

import Data.Char (ord)

stringToBytes :: String -> [Int]
stringToBytes = map ord

main :: IO ()
main = do
  let str = "hello"
      bytes = stringToBytes str
  print bytes

Output

[1 of 1] Compiling Main             ( main.hs, main.o )
Linking main ...
[104,101,108,108,111]

Example 2

In this example, string value is converted to byte value using B.pack function.

import qualified Data.ByteString.Char8 as B

stringToBytes :: String -> B.ByteString
stringToBytes = B.pack

main :: IO ()
main = do
  let str = "hello"
      bytes = stringToBytes str
  B.putStrLn bytes

Output

[1 of 1] Compiling Main             ( main.hs, main.o )
Linking main ...
hello

Example 3

In this example, string value is converted to byte value using B.pack function.

import qualified Data.ByteString.Char8 as B

main :: IO ()
main = do
  let str = "hello world"
      byteStr = B.pack str
  putStrLn $ "String: " ++ str
  putStrLn $ "ByteString: " ++ show byteStr

Output

[1 of 1] Compiling Main             ( main.hs, main.o )
Linking main ...
String: hello world
ByteString: "hello world"

Example 4

In this example, string value is converted to byte value using B.pack function.

import qualified Data.ByteString.Char8 as B

main :: IO ()
main = do
  let str = "hello world"
      byteStr = B.pack str
      byteList = B.unpack byteStr
  putStrLn $ "String: " ++ str
  putStrLn $ "ByteList: " ++ show byteList

Output

[1 of 1] Compiling Main             ( main.hs, main.o )
Linking main ...
String: hello world
ByteList: "hello world"

Example 5

In this example, string value is converted to byte value using fromEnum function.

import Data.List (map)

main :: IO ()
main = do
  let str = "hello world"
      byteList = map fromEnum str
  putStrLn $ "String: " ++ str
  putStrLn $ "ByteList: " ++ show byteList

Output

[1 of 1] Compiling Main             ( main.hs, main.o )
Linking main ...
String: hello world
ByteList: [104,101,108,108,111,32,119,111,114,108,100]

Conclusion

String value to byte value conversion in Haskell is the process of converting a sequence of characters represented as a string into a sequence of bytes. In Haskell, strings are represented as sequences of characters, while bytes are represented as sequences of numeric values in the range 0-255 that represent the values of individual bytes.