Cleaner/shorter way to update nested state in Redux?

Question

Sometimes reducers get kind of messy:

const initialState = {
    notificationBar: {
        open: false,
    },
};

export default function (state = initialS         


        

Answer 1

UPD: it's now a part of the ES2018

It might be slightly improved via a non-standardised yet properties spread syntax:

return {
    ...state,
    notificationBar: {
        ...state.notificationBar,
        open: true,
    },
};