Which answer is correct?

Use nested spread: ``` const next = { ...state, user: { ...state.user, address: { ...state.user.address, city: "NYC" } } }; ``` Verbose but dependency-free.

— spread_nester

Use `structuredClone(state)` then mutate the clone.

— clone_mutate

Use Immer's `produce()` function — write mutations and it produces immutable updates: ``` const next = produce(state, draft => { draft.user.address.city = "NYC"; }); ```

— immer_fan

Just mutate it: `state.user.address.city = "NYC"`. Immutability is overrated.

— just_mutate