Exploring MERN and React Components

What does MERN stand for?

• MongoDB, Express.js, React, Node.js

• PostgreSQL, Flask, Ember, Ruby

• MySQL, Angular, Vue, Django

• SQLite, Backbone.js, Svelte, ASP.NET

What is a React component?

• A React component is a CSS styling framework.

• A React component is a reusable piece of UI that can manage its own state and lifecycle.

• A React component is a server-side script.

• A React component is a type of database.

How do you create a class component in React?

• class MyComponent { render() { return 'Hello, World!'; } }

• class MyComponent extends React.Component { render() { return

  Hello, World!

  ; } }

• function MyComponent() { return

  Hello, World!

  ; }

• const MyComponent = () =>

  Hello, World!

  ;

What is the purpose of props in React?

• Props are a way to create global variables in React.

• The purpose of props in React is to enable data and event handling between components.

• Props are only for styling components in React.

• Props are used to manage state within a component.

How can you pass data from a parent to a child component?

• Use state to manage data in the child component.

• Directly modify the child component's internal state.

• Fetch data from an API in the child component.

• Use props to pass data from the parent component to the child component.

What is dynamic composition in React?

• Dynamic composition in React refers to using static components only.

• Dynamic composition is the process of optimizing performance in React applications.

• Dynamic composition in React is the practice of creating components that can change their structure and behavior at runtime.

• Dynamic composition involves creating components that cannot change after they are rendered.

What is the role of the server in a server-less application?

• The server is responsible for user interface design.

• The server only handles database queries.

• The server executes code in response to events and manages infrastructure automatically.

• The server stores all user data permanently.

How do you handle state in a React class component?

• Call 'setState()' without an object

• Use 'this.state' to manage state and 'this.setState()' to update it.

• Manage state using functional components only

• Use 'state' directly without 'this.'

What is the difference between props and state in React?

• Props are for passing data; state is for managing local component data.

• State is immutable; props can be changed at any time.

• Props can only be changed by the parent component; state can be changed by any component.

• Props are used for managing local component data; state is for passing data.

Can you explain the concept of composing components in React?

• Using only one component for the entire UI

• Composing components is not possible in React

• Composing components in React involves creating complex UIs by combining smaller, reusable components.

• Components cannot be reused in React