Dear Haskellers,

 let's  suppose I have the following lenses

 data Foo = Foo { _a :: String

                  _b :: [Double]

                  _c :: Vector Double

                  _d :: Int

                  .............. (more fields)

                  _z :: Double 

                }

Now, I want to update fields a,b,c and d without changing the rest.

What is the functional way of doing it ?

Surely there a function smarter than 

 set a "String" . set b [1,2,3] . set c  <1,2,3> . set d 4 $ foo

 

 can some please help me with it?

 

 Thanks in advance,

   

   Felipe Z.