Another update from ingydotnet^djgoku

Task/Determine-if-a-string-is-numeric/Elixir/determine-if-a-string-is-numeric.elixir

@@ -0,0 +1,14 @@
+defmodule RC do
+  def is_numeric(str) do
+    case Float.parse(str) do
+      {_num, ""} -> true
+      {_num, _r} -> false               # _r : remainder_of_bianry
+      :error     -> false
+    end
+  end
+end
+
+strs = ["123", "-12.3", "123.", ".05", "-12e5", "+123", " 123", "abc", "123a", "12.3e", "1 2"]
+Enum.each(strs, fn str ->
+  IO.puts "#{inspect str}\t=> #{RC.is_numeric(str)}"
+end)