This accessor combinator lets you access values inside lists.

listRecord = {foo = [{ bar = 2}
                    , {bar = 3}
                    , {bar = 4}
                    ]
             }


get (foo << onEach << bar) listRecord
-- returns [2, 3, 4] 


over (foo << onEach << bar) (+1) listRecord
-- returns {foo = [{ bar = 3}, {bar = 4}, {bar = 5}] }

This accessor combinator lets you access values inside Maybe.

maybeRecord = { foo = Just { bar = 2}
              , qux = Nothing
              }


get (foo << try << bar) maybeRecord
-- returns Just 2


get (qux << try << bar) maybeRecord
-- returns Nothing


over (foo << try << bar) (+1) maybeRecord
-- returns { foo = Just { bar = 3} , qux = Nothing }


over (qux << try << bar) (+1) maybeRecord
-- returns { foo = Just { bar = 2} , qux = Nothing }