Add Pipe Into A Case Statement as an elixir til

Author: jbranchaud

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_800 TILs and counting..._
+_801 TILs and counting..._
 
 ---
 
@@ -147,6 +147,7 @@ _800 TILs and counting..._
 - [Match On A Map In A With Construct](elixir/match-on-a-map-in-a-with-construct.md)
 - [Passing Around And Using Modules](elixir/passing-around-and-using-modules.md)
 - [Pattern Matching In Anonymous Functions](elixir/pattern-matching-in-anonymous-functions.md)
+- [Pipe Into A Case Statement](elixir/pipe-into-a-case-statement.md)
 - [Quitting IEx](elixir/quitting-iex.md)
 - [Range Into List Using Comprehensions](elixir/range-into-list-using-comprehensions.md)
 - [Refer To A Module Within Itself](elixir/refer-to-a-module-within-itself.md)

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

@@ -0,0 +1,33 @@
+# 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.