Add Pipe Into A Case Statement as an elixir til

elixir/pipe-into-a-case-statement.md

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+# Pipe Into A Case Statement
+
+The standard use of a case statement looks something like this:
+
+```elixir
+case HTTPoison.get(url) do
+  {:ok, %HTTPoison.Response{status_code: 200, body: body}} ->
+    IO.puts body
+  {:ok, %HTTPoison.Response{status_code: 404}} ->
+    IO.puts "Not found :("
+  {:error, %HTTPoison.Error{reason: reason}} ->
+    IO.inspect reason
+end
+```
+
+If you are a fan of the pipe syntax, then you may enjoying writing the above
+like this:
+
+```elixir
+url
+|> HTTPoison.get()
+|> case do
+  {:ok, %HTTPoison.Response{status_code: 200, body: body}} ->
+    IO.puts body
+  {:ok, %HTTPoison.Response{status_code: 404}} ->
+    IO.puts "Not found :("
+  {:error, %HTTPoison.Error{reason: reason}} ->
+    IO.inspect reason
+end
+```
+
+Just like any function, the value from the previous line in the pipe will be
+passed in and used as the value switched over in the case statement.