Add Pattern Matching In Anonymous Functions as an elixir til

README.md

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 warrant a full blog post. These are mostly things I learn by pairing with
 smart people at [Hashrocket](http://hashrocket.com/).
 
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+_443 TILs and counting..._
 
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 - [Execute Raw SQL In An Ecto Migration](elixir/execute-raw-sql-in-an-ecto-migration.md)
 - [Expose Internal Representation](elixir/expose-internal-representation.md)
 - [List Functions For A Module](elixir/list-functions-for-a-module.md)
+- [Pattern Matching In Anonymous Functions](elixir/pattern-matching-in-anonymous-functions.md)
 - [Quitting IEx](elixir/quitting-iex.md)
 - [Replace Duplicates In A Keyword List](elixir/replace-duplicates-in-a-keyword-list.md)
 - [Word Lists For Atoms](elixir/word-lists-for-atoms.md)

elixir/pattern-matching-in-anonymous-functions.md

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+# Pattern Matching In Anonymous Functions
+
+Pattern matching shows up everywhere in Elixir, even where you may not be
+expecting it. When declaring an anonymous function, you can use pattern
+matching against different sets and shapes of input parameters to invoke
+different behaviors.
+
+Here is an example of how you might use this:
+
+```ex
+> handle_result = fn
+  {:ok, result} -> IO.puts "The result is #{result}"
+  :error -> IO.puts "Error: couldn't find anything"
+end
+#Function<6.50752066/1 in :erl_eval.expr/5>
+
+> Map.fetch(%{a: 1}, :a) |> handle_result.()
+The result is 1
+:ok
+> Map.fetch(%{a: 1}, :b) |> handle_result.()
+Error: couldn't find anything
+:ok
+```
+
+[source](https://elixirschool.com/lessons/basics/functions#pattern-matching)