Vue Composition API State Definition
Organize component state with `ref` and `computed`, keeping logic separate from the view.
Vuejavascript
javascript
1import { ref, computed } from Vue;23export function useCart() {4 const items = ref([]);5 const total = computed(() =>6 items.value.reduce((sum, item) => sum + item.price * item.quantity, 0)7 );89 function add(item) {10 items.value.push(item);11 }1213 return { items, total, add };14}Key Points
- Encapsulate state and actions into functions for reuse across multiple components.
- `computed` caches results and recalculates only when dependencies change.
Usage suggestions
Run the copied code in a local sample project first to verify expected behavior, then adapt the naming and structure to your business needs. Pasting directly into a large project can cause you to overlook contextual differences.