Mindfire Solutions Reactjs Developer Interview Questions and Answers

Webpack is a module bundler for JavaScript applications.

• Webpack takes modules with dependencies and generates static assets representing those modules.

• It can handle various types of assets like JavaScript, CSS, images, and fonts.

• Webpack allows for code splitting, lazy loading, and hot module replacement.

• It has a rich plugin ecosystem to extend its functionality.

• Commonly used configuration file for webpack is webpack.co

Babel is a JavaScript compiler that converts modern JavaScript code into backward-compatible versions for browser compatibility.

• Babel allows developers to write code using the latest ECMAScript features without worrying about browser support.

• It transforms JSX syntax used in React components into regular JavaScript.

• Babel can also be configured to support specific browsers or environments.

• Plugins can be added to Babel fo

HOC stands for Higher Order Component in React, a pattern where a function takes a component and returns a new component.

• HOC is a function that takes a component and returns a new component with additional props or functionality.

• It is used for code reusability, logic abstraction, and cross-cutting concerns like logging, authentication, etc.

• Example: withAuth HOC can add authentication logic to a component by checking if

Lifecycle methods in React js are special methods that allow developers to hook into the component lifecycle and perform actions at specific points.

• componentDidMount() - called after the component is rendered for the first time

• componentDidUpdate() - called after the component's updates are flushed to the DOM

• componentWillUnmount() - called before the component is removed from the DOM