Another update from ingydotnet^djgoku

Task/Remove-duplicate-elements/Elixir/remove-duplicate-elements.elixir

@@ -0,0 +1,28 @@
+defmodule RC do
+  # hash table approach
+  def uniq1(list) do
+    Enum.reduce(list, HashSet.new, fn x, set -> Set.put(set, x) end)
+    |> Set.to_list
+  end
+
+  # Sort approach
+  def uniq2(list), do: Enum.sort(list) |> uniq2([])
+
+  defp uniq2([], uniq), do: Enum.reverse(uniq)
+  defp uniq2([h|t], uniq) when h==hd(uniq), do: uniq2(t, uniq)
+  defp uniq2([h|t], uniq)                 , do: uniq2(t, [h | uniq])
+
+  # Go through the list approach
+  def uniq3(list), do: uniq3(list, [])
+
+  defp uniq3([], uniq), do: Enum.reverse(uniq)
+  defp uniq3([h|t], uniq) do
+    if Enum.member?(uniq, h), do: uniq3(t, uniq), else: uniq3(t, [h | uniq])
+  end
+end
+
+list = [1,1,2,1,'redundant',[1,2,3],[1,2,3],'redundant']
+IO.inspect Enum.uniq(list)
+IO.inspect RC.uniq1(list)
+IO.inspect RC.uniq2(list)
+IO.inspect RC.uniq3(list)