Demonstrate put_in using atoms to manipulate nested values of a nested

Map
2017-01-22 11:15:17 -07:00
parent d467985778
commit 55f1648bbd
2 changed files with 11 additions and 0 deletions
--- a/lib/koans/11_structs.ex
+++ b/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