Should Actions in Redux always be unique?

Question

In this example I'm using an action named ADD_TODO

import { createStore, combineReducers } from 'redux';

function todos(state, action) {
    state = state || [];
    switch (action.type) {
        case 'ADD_TODO':
            return state.concat([ action.text ]);
        default:
            return state;
    }
}

function counter(state, action){
    state = state || 0;
    switch (action.type){
        case 'INCREMENT':
            return state+1;
        case 'DECREMENT':
            return state-1;
        case 'ADD_TODO':
            return state+100;
        default:
            return state;
    }
}

var app = combineReducers({
    todos: todos,
    counter: counter
});

var store = createStore(app);
store.dispatch({ type: 'ADD_TODO': text: 'buy eggs' });

This cause both the "todos" and "counter" reducers to trigger. Should I make all reducers have unique actions unless I actually intended it?

How can we implement this with multiple reducers that almost do the same thing? Multiple counters for example can have "INCREMENT" and a "DECREMENT" actions.

Should name spacing actions solve it?

eg: "POINT_INCREMENT", "POINT_DECREMENT".

Answer 1

There's nothing inherently wrong with having different reducers respond to the same action -- for example, if you refresh the entire state at once. But yeah, if you have two counters that correspond to different things, you probably want to come up with a naming scheme to differentiate. But I would think the action names probably should have some noun to indicate what they apply to.