Add part7

advanced/part7/src/CommentId.elm

@@ -0,0 +1,29 @@
+module CommentId exposing (CommentId, decoder, toString)
+
+import Json.Decode as Decode exposing (Decoder)
+
+
+
+-- TYPES
+
+
+type CommentId
+    = CommentId Int
+
+
+
+-- CREATE
+
+
+decoder : Decoder CommentId
+decoder =
+    Decode.map CommentId Decode.int
+
+
+
+-- TRANSFORM
+
+
+toString : CommentId -> String
+toString (CommentId id) =
+    String.fromInt id