Mern Full Stack Developer Interview Questions and Answers for Freshers

React is a JavaScript library for building user interfaces. State is a JavaScript object that stores data in a component. useEffect is a React hook for handling side effects.

• React is a library for building UI components

• State is a JavaScript object that stores data within a component

• useEffect is a hook used for handling side effects in React components

Callback functions are functions passed as arguments to other functions to be executed later.

• Callback functions are commonly used in asynchronous programming.

• They allow for functions to be executed after another function has finished.

• Examples include event listeners in web development.

EventLoop is a mechanism in JavaScript that allows for asynchronous operations to be executed in a non-blocking manner.

• EventLoop is responsible for handling asynchronous operations in JavaScript.

• It continuously checks the call stack and the task queue, moving tasks from the queue to the stack when the stack is empty.

• EventLoop ensures that JavaScript remains single-threaded and non-blocking, allowing for efficient handling of asynchronous tasks.

Components are reusable and independent units of code that encapsulate functionality and can be combined to build larger applications.

• Components are the building blocks of a software application.

• They are reusable and can be used multiple times in different parts of the application.

• Components can have their own state and can communicate with other components through props.

• Examples of components include buttons, forms, navigation bars, and cards.