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React Native Academy · Pelajaran

Membuat Penyimpanan Zustand

Pasang Zustand, definisikan penyimpanan dengan create, tambahkan properti keadaan dan fungsi tindakan, lalu pahami perbedaan penyimpanan tersebut dari arsitektur Redux.

Membuat Penyimpanan Zustand adalah pelajaran React Native Academy gratis di CoddyKit. Ini adalah pelajaran 1 dari 4. Kamu bisa membaca pelajaran lengkapnya di bawah secara gratis — lalu praktikkan langsung di browser dengan editor kode bawaan dan tutor AI 24/7. Ini adalah bagian dari jalur belajar React Native Academy, dan progresmu tersinkronisasi di web dan aplikasi CoddyKit. Kursus React Native Academy mencakup 4 pelajaran total.

Bagian dari pelajaran ini belum diterjemahkan dan ditampilkan dalam bahasa Inggris.

What Is Zustand?

Zustand (German for 'state') is a minimal, fast state management library for React. Unlike Redux, it requires no boilerplate like action creators, reducers, or a Provider wrapper. You define a store as a single function, and any component can subscribe to it with a simple hook. It is ideal for apps that need global state without the complexity of Redux Toolkit.

Installing Zustand

Install Zustand from npm with a single command. It has zero dependencies and is compatible with React Native out of the box. The package is lightweight — under 1 kB gzipped — which keeps your app's bundle size small.

npm install zustand

Creating Your First Store

Call create from Zustand and pass it a function that receives set and returns an object containing your state properties and actions. The returned value is a custom hook — conventionally named useXxxStore — that components call to access the store.

import { create } from 'zustand';

interface CounterStore {
  count: number;
  increment: () => void;
  decrement: () => void;
  reset: () => void;
}

export const useCounterStore = create<CounterStore>((set) => ({
  count: 0,
  increment: () => set((state) => ({ count: state.count + 1 })),
  decrement: () => set((state) => ({ count: state.count - 1 })),
  reset: () => set({ count: 0 }),
}));

The set Function

The set function is how Zustand updates state. You can pass it either a partial state object (Zustand merges it with existing state) or a callback that receives the current state and returns the updated portion. Zustand automatically notifies all subscribers when state changes.

// Partial object — Zustand merges it
set({ count: 0 });

// Callback — use when new value depends on previous value
set((state) => ({ count: state.count + 1 }));

// Replace entire state (pass true as second arg)
set(() => ({ count: 0, name: 'reset' }), true);

No Provider Needed

One of Zustand's biggest advantages over Redux is that you do not need to wrap your component tree in a Provider. The store lives outside React and components subscribe to it directly via the returned hook. This means you can use the store anywhere — in components, in callbacks, or even outside React components.

// No Provider needed — just use the hook anywhere
function CounterDisplay() {
  const count = useCounterStore((state) => state.count);
  return <Text>Count: {count}</Text>;
}

function CounterButtons() {
  const increment = useCounterStore((state) => state.increment);
  const decrement = useCounterStore((state) => state.decrement);
  return (
    <View>
      <Button title='+' onPress={increment} />
      <Button title='-' onPress={decrement} />
    </View>
  );
}

Subscribing to Specific State

Pass a selector function to the store hook to subscribe to only part of the state. The component re-renders only when the selected value changes. Without a selector, the component re-renders whenever any part of the store updates, which can hurt performance in large stores.

// Only re-renders when count changes
const count = useCounterStore((state) => state.count);

// Only re-renders when user.name changes
const username = useUserStore((state) => state.user.name);

// Without selector — re-renders on ANY store change (avoid this)
const everything = useCounterStore();

Accessing the Store Outside React

Zustand stores expose a getState() method that reads the current state synchronously without hooks. There is also a subscribe() method for non-React subscriptions and a setState() method for imperative updates. This is useful in utility functions, API interceptors, or navigation helpers that run outside React component lifecycle.

// Access store state anywhere — no hooks required
import { useCounterStore } from './counterStore';

// Read state outside React
const currentCount = useCounterStore.getState().count;

// Update state outside React
useCounterStore.getState().increment();

// Subscribe outside React
const unsub = useCounterStore.subscribe((state) => {
  console.log('Count changed to:', state.count);
});

Async Actions in Zustand

Zustand actions can be async — just mark the function async and call set after the await. You do not need special async utilities like Redux's createAsyncThunk. You can add loading and error state directly to the store and update them inside the async action.

export const usePostsStore = create<PostsStore>((set) => ({
  posts: [],
  loading: false,
  error: null,
  fetchPosts: async () => {
    set({ loading: true, error: null });
    try {
      const res = await fetch('https://api.example.com/posts');
      const data = await res.json();
      set({ posts: data, loading: false });
    } catch (e) {
      set({ error: 'Failed to load', loading: false });
    }
  },
}));

Comparing Zustand and Redux

Redux Toolkit is more structured and provides stronger conventions for large teams, time-travel debugging, and complex state. Zustand excels when you need global state with minimal ceremony — a single file, no action types, no Provider. Both are valid choices; pick Zustand for small-to-medium apps or when you want to move fast without Redux boilerplate.

Organizing Multiple Stores

In larger apps, split your state into multiple focused stores rather than one massive store. For example, create useAuthStore, useCartStore, and useSettingsStore separately. Each store file is small, independently testable, and imported only by the components that need it. This prevents unrelated state changes from triggering unnecessary re-renders.

// stores/authStore.ts
export const useAuthStore = create<AuthStore>((set) => ({ /* ... */ }));

// stores/cartStore.ts
export const useCartStore = create<CartStore>((set) => ({ /* ... */ }));

// Component imports only what it needs
import { useAuthStore } from '../stores/authStore';
import { useCartStore } from '../stores/cartStore';

Immer Middleware for Complex Updates

If your state is deeply nested and you want mutating-style updates (like Redux Toolkit's Immer integration), wrap the store creator with Zustand's immer middleware. With Immer, you can write state.user.preferences.theme = 'dark' instead of spreading every level of the object manually.

import { create } from 'zustand';
import { immer } from 'zustand/middleware/immer';

export const useSettingsStore = create(immer<SettingsStore>((set) => ({
  user: { name: '', preferences: { theme: 'light', notifications: true } },
  setTheme: (theme) => set((state) => {
    state.user.preferences.theme = theme; // Immer makes this safe
  }),
})));

Quick Check

Test your understanding of React Native Mobile Development concepts from this lesson.

Lesson Recap

In this lesson you learned: Zustand creates global stores with minimal boilerplate using a single create call, no Provider is required because the store lives outside the React tree, and async actions work natively by marking store functions as async. Next up we explore reading and updating Zustand store state in components.

Pertanyaan yang Sering Diajukan

Apakah pelajaran “Membuat Penyimpanan Zustand” gratis?

Ya — teks lengkap “Membuat Penyimpanan Zustand” gratis dibaca di sini di web. Untuk praktiknya secara interaktif (editor kode bawaan dan tutor AI 24/7) dan buka sisa kursus React Native Academy, upgrade ke CoddyKit PRO. Kursus React Native Academy mencakup 4 pelajaran total.

Apa yang akan aku pelajari di “Membuat Penyimpanan Zustand”?

Pasang Zustand, definisikan penyimpanan dengan create, tambahkan properti keadaan dan fungsi tindakan, lalu pahami perbedaan penyimpanan tersebut dari arsitektur Redux. Kamu berlatih React Native Academy dengan kode praktik yang langsung kamu jalankan di browser, dan tutor AI 24/7 menjawab pertanyaanmu saat kamu mengerjakan pelajaran ini.

Apakah aku perlu pengalaman untuk memulai React Native Academy?

Tidak diperlukan pengalaman sebelumnya. React Native Academy di CoddyKit dirancang untuk pemula hingga pelajar tingkat lanjut, jadi kamu bisa memulai di sini atau dari awal dan belajar sesuai kecepatan kamu sendiri. Ini adalah pelajaran 1 dari 4.

Berapa lama pelajaran “Membuat Penyimpanan Zustand” memakan waktu?

Sebagian besar pelajaran CoddyKit memakan waktu sekitar 5–10 menit. Setiap pelajaran ringkas dan interaktif, jadi kamu membuat kemajuan stabil dan melanjutkan dari tempat kamu tinggalkan di web dan aplikasi.

Bisakah aku menulis dan menjalankan kode dalam pelajaran React Native Academy ini?

Ya. Setiap pelajaran React Native Academy menyertakan editor kode bawaan, jadi kamu menulis dan menjalankan kode nyata langsung di browser dan mendapatkan umpan balik AI instan — tidak diperlukan penyiapan lokal.

Semua pelajaran dalam kursus ini

  1. Membuat Penyimpanan Zustand
  2. Membaca dan Memperbarui Keadaan Penyimpanan dalam Komponen
  3. Menyimpan Keadaan Zustand dengan AsyncStorage
  4. Pola Irisan dan Integrasi Devtools
← Kembali ke React Native Academy