\u3053\u3093\u306b\u3061\u306f\u3001\u9234\u6728\u3067\u3059\u3002<\/p>\n
\u4eca\u56de\u306f Yesod \u306e View \u5468\u308a\u3068\u3044\u3046\u3053\u3068\u3067\u3001Hamlet \u306b\u3064\u3044\u3066\u8abf\u3079\u307e\u3059\u3002<\/p>\n
<\/p>\n
\u7e70\u308a\u8fd4\u3057\u3092\u3059\u308b\u306b\u306f $forall \u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
\u307e\u305a\u3001\u7e70\u308a\u8fd4\u3057\u306b\u4f7f\u7528\u3059\u308b\u305f\u3081\u306e\u5909\u6570 values \u3092 Handler \u3067\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u5909\u6570 message \u306f\u5f8c\u3067\u4f7f\u7528\u3059\u308b\u306e\u3067\u3001\u3064\u3044\u3067\u306b\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
module Handler.Hello where\r\n\r\nimport Import\r\n\r\ngetHelloR :: Handler Html\r\ngetHelloR = do\r\n let\r\n message = \"Hello\"\r\n values = [1..10] :: [Int]\r\n defaultLayout $(widgetFile \"hello\")<\/pre>\nView (templates\/hello.hamlet) \u3067\u3001\u5909\u6570 values \u306e\u5024\u3092\u4e00\u3064\u305a\u3064\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n
$forall i <- values\r\n #{i}<\/pre>\n$if, $elseif, $else<\/h3>\n
\u6761\u4ef6\u5206\u5c90\u3092\u3059\u308b\u306b\u306f $if, $elseif, $else \u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
$if message == \"good morning!\"\r\n <p>\u304a\u306f\u3088\u3046\uff01\r\n$elseif message == \"hello!\"\r\n <p>\u3053\u3093\u306b\u3061\u306f\uff01\r\n$else\r\n <p>\u3055\u3088\u3046\u306a\u3089\uff01<\/pre>\n$maybe, $nothing<\/h3>\n
Maybe \u578b\uff08Maybe Int \u3068\u304b Maybe String \u3068\u304b\uff09\u3092\u6271\u3046\u306b\u306f $maybe \u3068 $nothing \u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
$maybe x <- lucky\r\n \u904b\u52e2\u306f #{x} \u3067\u3059\u3002\r\n$nothing\r\n \u904b\u52e2\u3092\u6e2c\u5b9a\u3067\u304d\u307e\u305b\u3093\u3002<\/pre>\nlucky \u304c \u300cJust 777 :: Maybe Int\u300d\u306a\u3069\u3067\u3042\u308c\u3070\u300c\u904b\u52e2\u306f 777 \u3067\u3059\u3002\u300d\u3068\u8868\u793a\u3055\u308c\u3001Nothing \u3067\u3042\u308c\u3070\u300c\u904b\u52e2\u3092\u6e2c\u5b9a\u3067\u304d\u307e\u305b\u3093\u3002\u300d\u3068\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n
$case, $of<\/h3>\n
\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u3092\u884c\u3046\u306b\u306f $case \u3068 $of \u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
\u4e0a\u8a18\u306e $maybe, $nothing \u306e\u4f8b\u3092 $case, $of \u3092\u4f7f\u7528\u3059\u308b\u3088\u3046\u306b\u66f8\u304d\u63db\u3048\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
$case lucky\r\n $of Just x\r\n \u904b\u52e2\u306f #{x} \u3067\u3059\u3002\r\n $of Nothing\r\n \u904b\u304c\u8db3\u308a\u307e\u305b\u3093\u3002<\/pre>\n$with<\/h3>\n
$with \u3092\u4f7f\u7528\u3059\u308b\u3068\u5f0f\u306e\u5225\u540d\uff08\u30b7\u30ce\u30cb\u30e0\uff09\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u9577\u3044\u5f0f\u3092\u4f55\u5ea6\u3082\u4f7f\u3046\u5834\u5408\u306f $with \u3092\u4f7f\u7528\u3059\u308b\u3068\u826f\u3055\u305d\u3046\u3067\u3059\u3002<\/p>\n
$with longMessage = message ++ \"!!!!!\"<\/pre>\n$newline never<\/h3>\n
\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u306f\u66f8\u304b\u308c\u3066\u3044\u306a\u3044\u3088\u3046\u306a\u306e\u3067\u3059\u304c\u3001\u300c$newline never\u300d\u3068\u66f8\u3044\u3066\u304a\u304f\u3068 HTML \u751f\u6210\u6642\u306b\u6539\u884c\u304c\u524a\u9664\u3055\u308c\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n
$newline never<\/pre>\n<\/p>\n
\u5909\u6570\u88dc\u9593: #{ ... }<\/h2>\n
\u5909\u6570\u306e\u5024\u3092\u57cb\u3081\u8fbc\u3080\u306b\u306f #{\u5909\u6570\u540d} \u3068\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
\u30e1\u30c3\u30bb\u30fc\u30b8\u306f #{message} \u3067\u3059\u3002<\/pre>\n<\/p>\n
Type-Safe URL: @{ ... }<\/h2>\n
URL \u3092\u751f\u6210\u3059\u308b\u306b\u306f @{\u30ea\u30bd\u30fc\u30b9\u540d} \u3068\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
\u30c8\u30c3\u30d7\u30da\u30fc\u30b8\u306e URL \u306f @{HomeR} \u3067\u3059\u3002\r\n\r\n<a href=@{HomeR}>\u30c8\u30c3\u30d7\u30da\u30fc\u30b8\u306f\u3053\u3061\u3089\uff01<\/a><\/pre>\n<\/p>\n
Widget \u306e\u57cb\u3081\u8fbc\u307f: ^{ ... }<\/h2>\n
Yesod \u3067\u306f\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306e\u4e2d\u306b\u4ed6\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u57cb\u3081\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u57cb\u3081\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u308b\u30d1\u30fc\u30c4\u306e\u3053\u3068\u3092 Widget \u3068\u547c\u3073\u307e\u3059\u3002<\/p>\n
\u307e\u305a\u306f Widget \u3092\u5b9a\u7fa9\u3057\u3066\u307f\u307e\u3059\u3002\uff08Handler\/Hello.hs\uff09<\/p>\n
sampleWidget :: Widget\r\nsampleWidget = $(widgetFile \"sample-widget\")<\/pre>\n\u6b21\u306b sampleWidget \u7528\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8 templates\/sample-widget.hamlet \u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n
<div>\r\n Widget \u3067\u3059\u3002<\/pre>\n\u4f5c\u6210\u3057\u305f sampleWidget \u3092\u57cb\u3081\u8fbc\u3080\u306b\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
^{sampleWidget}<\/pre>\n<\/p>\n
\u307e\u3068\u3081<\/h2>\n
\u5236\u5fa1\u69cb\u9020\u306a\u3069\u306f\u52d5\u7684\u306a\u30da\u30fc\u30b8\u3092\u751f\u6210\u3059\u308b\u5834\u5408\u306b\u306f\u5fc5\u9808\u306e\u6a5f\u80fd\u306a\u306e\u3067\u3001\u304d\u3061\u3093\u3068\u628a\u63e1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u305d\u3046\u3067\u3059\u3002<\/p>\n
\u4ed6\u306b\u3082 $maybe \u3084 $case \u306e\u3088\u3046\u306a Haskell \u3060\u304b\u3089\u3053\u305d\u5fc5\u8981\u306a\u6a5f\u80fd\u3084\u3001Widget \u306e\u3088\u3046\u306a\u30d1\u30fc\u30c4\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u4ed5\u7d44\u307f\u304c\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n
\u3046\u307e\u304f\u4f7f\u3044\u3053\u306a\u305b\u3070 View \u307e\u308f\u308a\u306e\u5b9f\u88c5\u304c\u7dba\u9e97\u306b\u3067\u304d\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
\u3053\u3093\u306b\u3061\u306f\u3001\u9234\u6728\u3067\u3059\u3002<\/p>\n
\u4eca\u56de\u306f Yesod \u306e View \u5468\u308a\u3068\u3044\u3046\u3053\u3068\u3067\u3001Hamlet \u306b\u3064\u3044\u3066\u8abf\u3079\u307e\u3059\u3002<\/p>\n