4 files changed, 70 insertions, 0 deletions
diff --git a/src/client/elm/Utils/Dict.elm b/src/client/elm/Utils/Dict.elm
new file mode 100644
index 0000000..dc01b17
--- /dev/null
+++ b/src/client/elm/Utils/Dict.elm
@@ -0,0 +1,11 @@
+module Utils.Dict
+  ( mapValues
+  ) where
+
+import Dict as Dict exposing (..)
+
+mapValues : (a -> b) -> Dict comparable a -> Dict comparable b
+mapValues f = Dict.fromList << List.map (onSecond f) << Dict.toList
+
+onSecond : (a -> b) -> (comparable, a) -> (comparable, b)
+onSecond f tuple = case tuple of (x, y) -> (x, f y)
diff --git a/src/client/elm/Utils/Either.elm b/src/client/elm/Utils/Either.elm
new file mode 100644
index 0000000..10c40e3
--- /dev/null
+++ b/src/client/elm/Utils/Either.elm
@@ -0,0 +1,9 @@
+module Utils.Either
+  ( toMaybeError
+  ) where
+
+toMaybeError : Result a b -> Maybe a
+toMaybeError result =
+  case result of
+    Ok _ -> Nothing
+    Err x -> Just x
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 -> []
diff --git a/src/client/elm/Utils/Validation.elm b/src/client/elm/Utils/Validation.elm
new file mode 100644
index 0000000..b9bccb3
--- /dev/null
+++ b/src/client/elm/Utils/Validation.elm
@@ -0,0 +1,23 @@
+module Utils.Validation
+  ( validateNonEmpty
+  , validateNumber
+  ) where
+
+import String
+import Reads exposing (readInt)
+
+validateNonEmpty : String -> String -> Result String String
+validateNonEmpty message str =
+  if String.isEmpty str
+   then Err message
+   else Ok str
+
+validateNumber : String -> (Int -> Bool) -> String -> Result String Int
+validateNumber message numberForm str =
+  case readInt str of
+    Just number ->
+      if numberForm number
+        then Ok number
+        else Err message
+    Nothing ->
+      Err message