function of generate Cmd msg from model

set of getter (big -> small) and setter (small -> big -> big)

create 'Do nothing' Transition

construct Prop from getter and setter

type alias Model =
  { name : String
  }


name_ = Transition.prop .name (\v m -> { m | name = v })

execute Transition

model |> Transition.exec Transition.none
-- ( model, Cmd.none )

update small that described by Prop

type alias Model =
  { sub : String
  }


sub_ = Transition.prop .sub (\v m -> { m | sub = v })


updateSub model = ( model ++ ", world", Transition.none )


{ sub = "hello" } |> Transition.update sub_ updateSub
-- ( { sub = "hello, world" }, Transition msg )

batch Transition

[ Transition.none
, Transition.none
] |> Transition.batch

map ( model, Transition ) tuple

type Msg
  = Sub SubMsg


updateSub : model -> ( model, Transition model SubMsg )


model |> updateSub |> Transition.map Sub
-- ( model, Transition model Msg )

compose ( model, Transition ) tuples

type alias Model =
  { sub : SubModel
  }


Transition.compose
  Model
    ( subModel, Transition.none )

compose ( model, Transition ) tuples

type alias Model =
  { sub   : SubModel
  , other : OtherModel
  }


Transition.compose
  Model
    ( subModel,   Transition.none )
    ( otherModel, Transition.none )

compose with 3 args

compose with 4 args

compose with 5 args

compose with 6 args

compose with 7 args

compose with 8 args