Master the Composition API in Vue 3.
Build scalable Vue applications with modern patterns.
Setup
const { createApp, ref, computed, onMounted } = Vue;
createApp({
setup() {
const count = ref(0);
const doubled = computed(() => count.value * 2);
const increment = () => count.value++;
onMounted(() => {
console.log(‘Component mounted’);
});
return { count, doubled, increment };
}
}).mount(‘#app’);
Composables
// useCounter.js
export function useCounter(initial = 0) {
const count = ref(initial);
const increment = () => count.value++;
return { count, increment };
}
Lifecycle Hooks
✅ onMounted
✅ onUpdated
✅ onUnmounted
✅ onBeforeMount
Conclusion
The Composition API enables better code reuse!