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Task/Palindrome-detection/Elm/palindrome-detection.elm

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+import String exposing (reverse, length)
+import Html exposing (Html, Attribute, text, div, input)
+import Html.Attributes exposing (placeholder, value, style)
+import Html.Events exposing (on, targetValue)
+import Html.App exposing (beginnerProgram)
+
+-- The following function (copied from Haskell) satisfies the
+-- rosettacode task description.
+is_palindrome x = x == reverse x
+
+-- The remainder of the code demonstrates the use of the function
+-- in a complete Elm program.
+main = beginnerProgram { model = "" , view = view , update = update }
+
+update newStr oldStr = newStr
+
+view : String -> Html String
+view candidate =
+  div []
+    ([ input
+        [ placeholder "Enter a string to check."
+        , value candidate
+        , on "input" targetValue
+        , myStyle
+        ]
+        []
+     ] ++
+     [ let testResult =
+             is_palindrome candidate
+
+           statement =
+             if testResult then "PALINDROME!" else "not a palindrome"
+
+       in div [ myStyle] [text statement]
+     ])
+
+myStyle : Attribute msg
+myStyle =
+  style
+    [ ("width", "100%")
+    , ("height", "20px")
+    , ("padding", "5px 0 0 5px")
+    , ("font-size", "1em")
+    , ("text-align", "left")
+    ]