Multiple handlers for a single action type

[zernie]

Currently there is no way to specify a reducer for a single action type but with multiple handlers. It would look like this:

.caseWithHandlers(action, [handlerA, handlerB])

[dphilipson]

Hi Zernie,

To make sure I understand what you mean, what is the effect of doing this? Do you want it to apply the two handlers in order, i.e.

const reducer = reducerWithInitialState(INITIAL_STATE)
    .caseWithHandlers(actionCreator, [handlerA, handlerB])

is equivalent to

function reducer(state = INITIAL_STATE, action) {
     if (isType(action, actionCreator) {
          return handlerB(handlerA(state, action.payload), action.payload);
    }
}

Can you describe a situation where this would be useful, i.e. why would defining a handler in two parts increase clarity?

Supposing there's a good use case for this, you can already achieve this functionality by using reduce-reducers, i.e.

.case(action, reduceReducers(handlerA, handlerB))

Because this is already possible through composition, I'm inclined to say it is unnecessary to include this functionality into the API of this library. Let me know if you disagree.

[dphilipson]

Closing for inactivity. Feel free to re-open if you have more comments.