Using incomes to compute a fair computation to designate the payer

1 files changed, 19 insertions, 1 deletions

diff --git a/src/client/Utils/Maybe.elm b/src/client/Utils/Maybe.elm
index 507d9a4..d954ae0 100644
--- a/src/client/Utils/Maybe.elm
+++ b/src/client/Utils/Maybe.elm
@@ -1,9 +1,27 @@
 module Utils.Maybe
   ( isJust
+  , catMaybes
+  , maybeToList
   ) where
 
 isJust : Maybe a -> Bool
 isJust maybe =
   case maybe of
-    Just _ -> True
+    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 -> []