return update(state, {
    [newestState.findIndex(list=>list.id===action.list)]: {
        entries: entries => update(
            entries, {
                $splice: [[entries.findIndex(item=>item.id===action.item),0]]
            }
        )
    }
});

return update(state, {
    [newestState.findIndex(list=>list.id===action.list)]: {
        entries: entries => entries.filter(elem => elem.id != action.item )
    }
});