Another update from ingydotnet^djgoku

Task/Forward-difference/Elixir/forward-difference.elixir

@@ -0,0 +1,15 @@
+defmodule Diff do
+  def forward(list,i\\1) do
+    forward(list,[],i)
+  end
+
+  def forward([_],diffs,1), do: IO.inspect diffs
+  def forward([_],diffs,i), do: forward(diffs,[],i-1)
+  def forward([val1,val2|vals],diffs,i) do
+    forward([val2|vals],diffs++[val2-val1],i)
+  end
+end
+
+Enum.each(1..9, fn i ->
+  Diff.forward([90, 47, 58, 29, 22, 32, 55, 5, 55, 73],i)
+end)