Libraries import in Haskell

In Haskell, you can import libraries using the import keyword followed by the name of the library module. Here's an example:

import Data.List
sortedList = sort [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5]
main = do

  putStrLn "Here is the sorted list:"

  print sortedList

In this example, we are importing the Data.List module which provides various list manipulation functions. We then use the sort function to sort a list of integers. Finally, we print out the sorted list using putStrLn and print.

Another example using the Data.Map library:

import qualified Data.Map as Map
ages = Map.fromList [("Alice", 25), ("Bob", 30), ("Charlie", 22)]
main = do

  putStrLn "Here are the ages:"

  print $ Map.lookup "Alice" ages

  print $ Map.lookup "Bob" ages

  print $ Map.lookup "Eve" ages

In this example, we are importing the Data.Map module and giving it an alias Map. We then create a Map data structure with age values for three people. Finally, we use the lookup function to print out the age of Alice, Bob, and Eve (who is not in the map).