ConditionsFunction.hs

module ConditionsFunction where

messageFunc :: String -> String -> String

-- | In this example we show how a simple nested if works
messageFunc name surname= if(name =="Paul")
                   then "Hey " ++ name ++ " how you doing!"
                   else if(surname == "Perez")
                        then surname ++".... Ah!, I know your family"
                   else "Do I know you?"

-- | In this example we show how if else works more similar to pattern matching.
messageCaseFunc name surname
             |  name == "Paul" = "Hey " ++ name ++ " how you doing!"
             |  surname == "Perez" = surname ++".... Ah!, I know your family"
             |  otherwise = "Do I know you?"

-- | Here another example of patter matching over a variable. [case] value_to_match [of] cases just like in Scala
word = "Hello"
outputPatternMatching = case word of
                 "Hello" -> "Hi, how are you?"
                 "Bye" -> "Why are you leaving so soon?"

-- | Just like in Scala all if/else conditions return a value, so one more time Haskell dont allow mutability
isPaul = (\name -> name == "Paul") :: String -> Bool
outputValue = \name -> if(isPaul name)
                       then "Hey Paul"
                       else "Who are you"