Proxy-Based Reactive Data Handling The reactive system can be implemented using JavaScript's Proxy API to intercept property access and modifications: const userData = { username: 'alexchen', userAge: 25 } function createReactive(source) { const interceptor = { get(source, property, receiver) { cons...
1. The Essence of Reactivity Reactivity is about linking data and functions together. When the data changes, the associated functions automatically execute. However, there are constraints on what qualifies as a function and what qualifies as data. Functions that participate in reactivity: render com...
Managing shared state between parent and child components requires strict attention to object reference stability. The following component architecture demonstrates how inline propp assignments can trigger a infinite rendering cycle: <!-- DataTable.vue --> <template> <div> <span...
Setup Function and Basic Reactivity The setup() function serves as the entry point for Vue 3's Composition API, executing before component creation. <template> <div>Composition API: {{ message }}</div> <div>Options API: {{ legacyMessage }}</div> <div> Array iterat...
Reactivity System Overhaul Vue 2's Approach Vue 2 implements two-way data binding using Object.defineProperty() to intercept property access combined with a publish-subscribe pattern. const vm = new Vue({ data: { counter: 0 }, // Internal transformation creates getters/setters // counter becomes rea...
Vue3 introduces two fundamental reactivity APIs: ref and reactive. These tools enable developers to create responsive data structures efficiently. 1. Core Concepts 1.1 Ref API ref creates a reactive reference to a primitive value: import { ref } from 'vue'; const counter = ref(0); console.log(counte...
The Problem with Direct Property Addition Consider a Vue component with a v-for directive: <p v-for="(value, key) in item" :key="key"> {{ value }} </p> <button @click="addProperty">Add New Property</button> With the following Vue instance: const...
Frontend Framework Architecture & Vue 3 Motivations Modern frontend frameworks like Vue emphasize simplicity and a data-driven approach. By reducing direct DOM manipulation, frameworks leverage reactivity systems, declarative rendering, and virtual DOM diffing to efficiently synchronize the UI w...
Both watch and watchEffect are built on Vue 3's shared reactivity system, differing only in their dependency tracking behavior and usage syntax. Reactivity Dependency Tracking To understand the difference between the two APIs, it helps to first cover how Vue 3's reactivity system operates at a high...