A library providing Fisher--Yates in-place shuffles and related functionality.
As an example of how to use it:
module Main where
import Data.Vector
import Immutable.Shuffle
main :: IO ()
main =
do
shuffleMyVector >>= print
cycleMyVector >>= print
derangeMyVector >>= print
myVector :: Vector Int
myVector = fromList [1..10]
shuffleMyVector :: IO (Vector Int)
shuffleMyVector = shuffleM myVector
cycleMyVector :: IO (Vector Int)
cycleMyVector = maximalCycleM myVector
derangeMyVector :: IO (Vector Int)
derangeMyVector = derangementM myVector
> main
[2,8,1,5,10,9,7,3,6,4]
[6,8,4,10,9,2,5,7,3,1]
[8,5,4,1,10,9,3,6,2,7]
> main
[7,9,3,5,10,6,8,1,2,4]
[2,4,10,7,8,1,5,9,3,6]
[4,8,5,2,7,3,9,6,10,1]
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