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Interview Questions and Answers

Optimization techniques include: using lazy loading for components and images, optimizing computed properties and watchers, using `v-once` for static content, avoiding unnecessary re-renders, and using production builds.

Two-way data binding allows you to automatically update the view when the model changes, and vice versa. Its typically achieved using the `v-model` directive, which synchronizes the value of an input element with a data property.

You can use conditional rendering with the `v-if`, `v-else-if`, and `v-else` directives to conditionally display elements based on a condition.

You can render lists using the `v-for` directive, which iterates over an array and renders an element for each item in the array.

Single-file components (.vue files) encapsulate HTML, CSS, and JavaScript logic within a single file, making it easier to organize and manage components.

You can handle forms using `v-model` for two-way data binding with form inputs, and the `@submit` event to handle form submissions. You can also use modifiers like `.lazy`, `.number`, and `.trim` with `v-model`.

Advantages include its ease of learning, its progressive nature, its component-based architecture, its performance, and its strong community support.

Vuex is Vue.jss official state management library. It provides a centralized store for all the components in an application, making it easier to manage and share state across components.

The core concepts of Vuex are: State (the single source of truth), Mutations (the only way to change the state), Actions (commit mutations, can be asynchronous), Getters (computed properties for the state), and Modules (divide the store into modules).

Vue Router is Vue.jss official routing library. It allows you to create single-page applications with multiple views and navigation between them.

Directives are special attributes that start with `v-` and are used to add reactive behavior to the DOM. Examples include `v-if`, `v-for`, `v-bind`, and `v-on`.

Vue Components are reusable and composable UI elements that encapsulate HTML, CSS, and JavaScript logic. They allow you to break down complex UIs into smaller, manageable pieces.

You pass data from a parent to a child component using `props`. The parent component binds data to the prop attribute, and the child component declares the prop using the `props` option.

You emit events from a child component to a parent component using `$emit`. The child component calls `$emit(event-name, data)`, and the parent component listens for the event using `v-on:event-name` or `@event-name`.

Computed properties are properties that are dynamically calculated based on other reactive data. They are cached based on their dependencies and only re-evaluated when those dependencies change.

Watchers are functions that are executed when a specific reactive data property changes. They are useful for performing asynchronous or expensive operations in response to data changes.

Vue.js is a progressive JavaScript framework for building user interfaces. Its designed to be incrementally adoptable, focusing on the view layer. Its easy to learn and integrate with other libraries or existing projects.

Key features include: Declarative Rendering (using templates), Reactivity (automatic tracking of dependencies), Components (reusable and composable UI elements), and Routing & State Management (through official libraries Vue Router and Vuex).

Vue 3 offers improved performance, smaller bundle size, better TypeScript support, a new composition API, and other internal architectural improvements compared to Vue 2.

The Virtual DOM is a lightweight representation of the actual DOM in memory. Vue.js uses it to efficiently update the DOM by comparing the virtual DOM with the actual DOM and only applying necessary changes.