Adding a new object to state, is it a mutation?

Question

redux

I want to make something like a stack where new data will be added:

case SET_STACK:
  state[action.name] = {
    use: action.use,
    title: action.title,
    tab: action.tab
  }
  return state

But is it possible to do this in redux? Is this a mutation?

Answer 1

This is a mutation, you must return a new state.
make a stack history of the state and that's it, and in the store always return the new state

Answer 2

Use for example

return {...state ,
   use: action.use,
    title: action.title,
    tab: action.tab
}

This is a clone of the state, with new values