Vue Reactivity System

Master Vue's reactivity system to build reactive, performant applications with optimal state management and computed properties.

Reactivity Fundamentals (Proxy-based)

Vue 3 uses JavaScript Proxies for reactivity:

import { ref, reactive, isRef, isReactive, isProxy } from 'vue';

// ref creates reactive wrapper
const count = ref(0);
console.log(isRef(count)); // true
console.log(isProxy(count)); // false (ref itself isn't proxy)
console.log(isProxy(count.value)); // false for primitives

// reactive creates proxy