// store/slices/userSlice.js export const createUserSlice = (set) => ( user: null, setUser: (user) => set( user ), ) // store/slices/cartSlice.js export const createCartSlice = (set) => ( cartItems: [], addToCart: (item) => set((state) => ( cartItems: [...state.cartItems, item] )) )
const useStore = create((...args) => ( ...createUserSlice(...args), ...createCartSlice(...args) )) Zustand’s true strength comes from its middleware ecosystem. 1. Persist Middleware (localStorage) import create from 'zustand' import persist, createJSONStorage from 'zustand/middleware' const useStore = create( persist( (set) => ( theme: 'light', setTheme: (theme) => set( theme ), ), zust4help full
Zustand is not tied to React. You can use it in vanilla JS: // store/slices/userSlice
| Feature | Zustand | Redux Toolkit | Context + useReducer | |---------|---------|---------------|----------------------| | Boilerplate | Very low | Medium | High | | Provider required | No | Yes | Yes | | DevTools support | Yes (middleware) | Yes | No | | Async actions | Native | Thunk/Saga | Manual | | Performance | Excellent | Good | Poor (re-renders) | | Learning curve | Minimal | Steep | Moderate | | Bundle size | ~1.5 kB | ~15 kB | ~0 kB (built-in) | Part 8: Real-World Example – Complete E-Commerce Cart import create from 'zustand' import persist from 'zustand/middleware' import shallow from 'zustand/shallow' const useCartStore = create( persist( (set, get) => ( items: [], addItem: (product) => set((state) => const existing = state.items.find((i) => i.id === product.id) if (existing) return items: state.items.map((i) => i.id === product.id ? ...i, quantity: i.quantity + 1 : i ), You can use it in vanilla JS: |
useEffect(() => const unsubscribe = useStore.subscribe( (state) => state.someValue, (value) => console.log(value) ) return unsubscribe , [])