jadlr

import akka.stream.FlowShape
import akka.stream.scaladsl.{Flow, GraphDSL, Source, Zip}

import scala.concurrent.duration.FiniteDuration

object RateLimiter {

  private def rateLimiter[A](rate: FiniteDuration) = {

    case object Tick

jadlr

defmodule ListPermutations do

  def list_permutations(_, 0), do: [[]]
  def list_permutations([], _), do: []
  def list_permutations([h|t], n), do: Enum.map(list_permutations(t, n-1), fn(l) -> [h|l] end) ++ list_permutations(t, n)

end

jadlr

module ListPermutations where

listPermutations :: [a] -> Integer -> [[a]]
listPermutations _ 0      = [[]]
listPermutations [] _     = []
listPermutations (x:xs) n = fmap (x:) (listPermutations xs (n - 1)) ++ listPermutations xs n

jadlr

module ListPermutations where

listPermutations :: Integer => [a] -> b -> [[a]]
listPermutations l n = snd $ permutate l n
  where permutate :: Integer => [a] -> b -> ([[a]], [[a]])
        permutate [] _ = ([[]], [])
        permutate (x:xs) n = let (pt, acc) = permutate xs n in permutateInner x pt pt acc n
          where permutateInner :: Integer => a -> [[a]] -> [[a]] -> [[a]] -> b -> ([[a]], [[a]])
                permutateInner _ [] pt acc _ = (pt, acc)
                permutateInner h (x:xs) pt acc n