Add the haskell book

1 files changed, 40 insertions, 0 deletions

diff --git a/Haskell-book/11/Programmer.hs b/Haskell-book/11/Programmer.hs
new file mode 100644
index 0000000..4d27fe0
--- /dev/null
+++ b/Haskell-book/11/Programmer.hs
@@ -0,0 +1,40 @@
+module Programmer where
+
+data OperatingSystem = GnuPlusLinux
+                     | OpenBSDPlusNevermindJustBSDStill
+                     | Mac
+                     | Windows
+                     deriving (Eq, Show)
+
+data ProgLang = Haskell
+              | Agda
+              | Idris
+              | PureScript
+              deriving (Eq, Show)
+
+data Programmer = Programmer { os :: OperatingSystem
+                             , lang :: ProgLang }
+                  deriving (Eq, Show)
+
+allOperatingSystems :: [OperatingSystem]
+allOperatingSystems =
+    [ GnuPlusLinux
+    , OpenBSDPlusNevermindJustBSDStill
+    , Mac
+    , Windows
+    ]
+
+allLanguages :: [ProgLang]
+allLanguages =
+    [ Haskell
+    , Agda
+    , Idris
+    , PureScript
+    ]
+
+allProgrammers :: [Programmer]
+allProgrammers = do
+    o <- allOperatingSystems
+    l <- allLanguages
+    return Programmer { os = o
+                      , lang = l }