Demonstrate put_in using atoms to manipulate nested values of a nested

Map

lib/koans/11_structs.ex

@@ -59,4 +59,14 @@ defmodule Structs do
     airline = %Airline{plane: %Plane{maker: :boeing, passengers: 200}}
     assert update_in(airline.plane.passengers, &(&1 + 2)) == ___
   end
+
+  koan "Use the put_in macro with atoms to replace a nested value in a non-struct" do
+    airline = %{
+                  plane: %{
+                    maker: :boeing
+                  },
+                  name: "Southwest"
+              }
+    assert put_in(airline[:plane][:maker], :cessna) == ___
+  end
 end

test/koans/structs_koans_test.exs

@@ -12,6 +12,7 @@ defmodule StructsTests do
       {:ok, 22},
       %Structs.Airline{plane: %Structs.Plane{maker: :airbus}, name: "Southwest"},
       %Structs.Airline{plane: %Structs.Plane{maker: :boeing, passengers: 202}, name: "Southwest"},
+      %{plane: %{maker: :cessna}, name: "Southwest"},
     ]
 
     test_all(Structs, answers)