1 files changed, 27 insertions, 0 deletions
diff --git a/src/client/elm/Utils/Maybe.elm b/src/client/elm/Utils/Maybe.elm
new file mode 100644
index 0000000..d954ae0
--- /dev/null
+++ b/src/client/elm/Utils/Maybe.elm
@@ -0,0 +1,27 @@
+module Utils.Maybe
+  ( isJust
+  , catMaybes
+  , maybeToList
+  ) where
+
+isJust : Maybe a -> Bool
+isJust maybe =
+  case maybe of
+    Just _  -> True
+    Nothing -> False
+
+catMaybes : List (Maybe a) -> List a
+catMaybes =
+  List.foldr
+    (\mb xs ->
+      case mb of
+        Just x  -> x :: xs
+        Nothing -> xs
+    )
+    []
+
+maybeToList : Maybe a -> List a
+maybeToList mb =
+  case mb of
+    Just a  -> [a]
+    Nothing -> []