Top React JS Interview Questions & Answers for 2025
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08 Jan, 2025
React Interview Questions and Answers Updated
React's reconciliation process is the algorithm that determines how the UI should be updated when the state or props of a component change. It is responsible for comparing the old virtual DOM with the new one, figuring out the differences, and updating the actual DOM as efficiently as possible. This process is crucial for optimizing performance and ensuring that React only makes the necessary changes to the DOM.
08 Jan, 2025
ReactJS Interview Questions and Answers(New)
React is an open-source JavaScript library developed by Facebook for building user interfaces, particularly single-page applications (SPAs) where you need a fast, interactive user experience. It enables developers to build large web applications that can update and render efficiently in response to data changes.
08 Jan, 2025
React Interview Questions
The useEffect hook is one of the most important hooks in React. It allows you to perform side effects in functional components, such as fetching data, updating the DOM, subscribing to events, or cleaning up resources like timers and subscriptions. It is React's answer to lifecycle methods (componentDidMount, componentDidUpdate, and componentWillUnmount) in class components.
08 Jan, 2025
React Interview Questions and Answers
React Router is a popular library for managing routing in React applications. It allows you to define multiple routes in your app and enables navigation between different components or views without reloading the page. React Router helps in building single-page applications (SPA) by managing the history of URL changes and rendering the correct components based on the URL.
08 Jan, 2025
ReactJS Interview Questions and Answers
In React, components are the building blocks of the user interface (UI). They are reusable, self-contained pieces of code that manage their own content, state, and rendering. A React component typically returns a part of the UI that is rendered onto the screen, and it can be reused in different places within the application.
08 Jan, 2025
ReactJS Interview Questions
The lifecycle of a React component refers to the series of methods that are invoked at different stages of a component’s existence, from its creation (mounting) to its removal (unmounting) from the DOM. The component lifecycle methods provide developers with hooks for running code at specific times during a component's life. These methods are available primarily in class components, but with the introduction of Hooks in React 16.8, functional components can now also manage lifecycle events.
08 Jan, 2025
Top React Interview Questions for Developers
The Context API in React is a feature that allows you to share state or other values across your application without having to pass props down manually at every level of the component tree. It provides a way to manage global state and avoid prop drilling, which occurs when you pass data through many layers of components just to reach a deeply nested component.
08 Jan, 2025
Top ReactJS Interview Questions for Developers
A Higher-Order Component (HOC) is a function in React that takes a component and returns a new component with additional functionality. HOCs are a pattern used for reusing component logic. They don't modify the original component directly; instead, they enhance the component by adding extra behavior or props.
31 Dec, 2024
Most Frequently asked react-native Interview Questions (2024)
React Native and React (also known as React.js) are both open-source libraries developed by Facebook, but they serve different purposes and are used in different contexts. Here’s an explanation of what each is and how they differ
26 Dec, 2024