From 678d15de0722f84b2b218a5c9087cd26b6f76c03 Mon Sep 17 00:00:00 2001
From: Shannon Oram <shannon.oram@gmail.com>
Date: Sun, 8 Jul 2018 12:18:30 +1000
Subject: [PATCH 1/3] Add koan "You can use pattern matching to define [...]"

Koan added following comment on Github.
https://github.com/elixirkoans/elixir-koans/issues/222#issuecomment-399979891

[quote]
And, in fact, you can define multiple cases for a function using this sytnax:

```
lolwat = fn
  "lol" -> "wat"
  _ -> "haha"
end
lolwat.("lol")
# => "wat"
lolwat.("anything")
# => "haha"
lolwat.("rly")
# => "haha"
```

[/quote]
---
 lib/koans/13_functions.ex | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/koans/13_functions.ex b/lib/koans/13_functions.ex
index c20a4785..18a0c66b 100644
--- a/lib/koans/13_functions.ex
+++ b/lib/koans/13_functions.ex
@@ -78,6 +78,16 @@ defmodule Functions do
     assert three_times.("foo") == ___
   end
 
+  koan "You can use pattern matching to define multiple cases for anonymous functions" do
+    format_result = fn
+      {:ok, result} -> "Success is #{result}"
+      {:error, reason} -> "You just lost #{reason}"
+    end
+
+    assert format_result.({:ok, "no accident"}) == ___
+    assert format_result.({:error, "the game"}) == ___
+  end
+
   def times_five_and_then(number, fun), do: fun.(number * 5)
   def square(number), do: number * number
 

From 362cbf77c008d08eebdb05e553ebac95b28a592e Mon Sep 17 00:00:00 2001
From: Shannon Oram <shannon.oram@gmail.com>
Date: Sun, 8 Jul 2018 12:18:30 +1000
Subject: [PATCH 2/3] Rename function. format_result() -> inspirational_quote()

---
 lib/koans/13_functions.ex | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/koans/13_functions.ex b/lib/koans/13_functions.ex
index 18a0c66b..add576b0 100644
--- a/lib/koans/13_functions.ex
+++ b/lib/koans/13_functions.ex
@@ -79,13 +79,13 @@ defmodule Functions do
   end
 
   koan "You can use pattern matching to define multiple cases for anonymous functions" do
-    format_result = fn
+    inspirational_quote = fn
       {:ok, result} -> "Success is #{result}"
       {:error, reason} -> "You just lost #{reason}"
     end
 
-    assert format_result.({:ok, "no accident"}) == ___
-    assert format_result.({:error, "the game"}) == ___
+    assert inspirational_quote.({:ok, "no accident"}) == ___
+    assert inspirational_quote.({:error, "the game"}) == ___
   end
 
   def times_five_and_then(number, fun), do: fun.(number * 5)

From 38cbc98f81fc1ae66b9b472240575155c7600aad Mon Sep 17 00:00:00 2001
From: Shannon Oram <shannon.oram@gmail.com>
Date: Thu, 12 Jul 2018 10:36:12 +1000
Subject: [PATCH 3/3] Add test for new koan

---
 test/koans/functions_koans_test.exs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/koans/functions_koans_test.exs b/test/koans/functions_koans_test.exs
index 78b47d1a..eb48b502 100644
--- a/test/koans/functions_koans_test.exs
+++ b/test/koans/functions_koans_test.exs
@@ -15,6 +15,7 @@ defmodule FunctionsTests do
       6,
       "Hi, Foo!",
       ["foo", "foo", "foo"],
+      {:multiple, ["Success is no accident", "You just lost the game"]},
       100,
       1000,
       "Full Name",