September 2017 Update

Task/Factorial/Elixir/factorial.elixir

@@ -9,7 +9,17 @@ defmodule Factorial do
   def fac_tail(1, acc), do: acc
   def fac_tail(n, acc) when n > 1, do: fac_tail(n - 1, acc * n)
 
+  # Tail recursive function with default parameter
+  def fac_default(n, acc \\ 1)
+  def fac_default(0, acc), do: acc
+  def fac_default(n, acc) when n > 0, do: fac_default(n - 1, acc * n)
+
   # Using Enumeration features
   def fac_reduce(0), do: 1
   def fac_reduce(n) when n > 0, do: Enum.reduce(1..n, 1, &*/2)
+
+  # Using Enumeration features with pipe operator
+  def fac_pipe(0), do: 1
+  def fac_pipe(n) when n > 0, do: 1..n |> Enum.reduce(1, &*/2)
+
 end