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  1. Practice
  2. Functional Programming
  3. Introduction
  4. Reverse a List
  5. Discussions

Reverse a List

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  • FlavioFernandes4
     + 3 comments

    Scala:

    arr.foldLeft(List[Int]())((acc,v) => v::acc)

  • __spartax
     + 8 comments
    rev [] = []
rev (h:t) = rev t ++ [h]

  • luizpericolo
     + 3 comments

    My Scala solution:

    def f(arr:List[Int]):List[Int] = {
    def revList(orig: List[Int], rev: List[Int]): List[Int] = {
        orig match {
            case Nil => rev
            case x::xs => revList(xs, x :: rev)
        }
    }
    revList(arr, Nil)
}

  • rudaliszka
     + 1 comment

    In Clojure: (fn [lst] (reduce conj '() lst))

  • chrissphinx
     + 1 comment

    Not enough Elixir love:

    IO.stream(:stdio, :line)
|> Enum.map(&String.trim/1)
|> Enum.reduce([], &([&1 | &2]))
|> Enum.each(&IO.puts/1)
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