1 files changed, 34 insertions, 0 deletions
diff --git a/src/client/Utils/Maybe.elm b/src/client/Utils/Maybe.elm
new file mode 100644
index 0000000..46456e1
--- /dev/null
+++ b/src/client/Utils/Maybe.elm
@@ -0,0 +1,34 @@
+module Utils.Maybe exposing
+  ( isJust
+  , cat
+  , toList
+  , orElse
+  )
+
+isJust : Maybe a -> Bool
+isJust maybe =
+  case maybe of
+    Just _  -> True
+    Nothing -> False
+
+cat : List (Maybe a) -> List a
+cat =
+  List.foldr
+    (\mb xs ->
+      case mb of
+        Just x  -> x :: xs
+        Nothing -> xs
+    )
+    []
+
+toList : Maybe a -> List a
+toList mb =
+  case mb of
+    Just a  -> [a]
+    Nothing -> []
+
+orElse : Maybe a -> Maybe a -> Maybe a
+orElse mb1 mb2 =
+  case mb1 of
+    Just x -> Just x
+    Nothing -> mb2