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The content is aimed at freshers and interview preparation.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/exam/","Exam",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/50-reactjs-interview-questions-2024-common-basic-advanced/391764/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/50-reactjs-interview-questions-2024-common-basic-advanced/391764.png","ImageObject",300,407,{"name":42,"@type":43},"Theodore","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-09","2026-09-25",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",12,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What is React and what does it help developers do?","Question",{"text":63,"@type":64},"React is a JavaScript library for building user interfaces. 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So, if you're new to React and prepping for your first interview, this section can be your React bootcamp. We'll explore some fundamental React concepts through commonly asked basic interview questions.  \n1. What is React?  \nReact is a JavaScript library for building user interfaces. It allows you to create reusable components that manage their own state and efficiently update the UI.  \n2. What are Components in React?  \nComponents are the building blocks of React applications. They are reusable pieces of code that encapsulate functionality and UI. You can think of them as independent modules that display a specific part of your application's interface.  \n3. Explain JSX in React.  \nJSX (JavaScript XML) is a syntax extension that lets you write HTML-like structures within your JavaScript code. It improves readability and makes it easier to visualize the structure of your UI components.  \nExample:  \n4. Explain the concept of the Virtual DOM.  \nThe Virtual DOM ( Document Object Model) is a concept implemented in React that provides a programming API that works like a lightweight copy of the actual DOM. This means that whenever a component’s state changes, the Virtual DOM gets updated instead of the real DOM. React then efficiently updates the real DOM to match the Virtual DOM, minimizing performance costs and enhancing user experience.  \n5. Distinguish between a Class component and a Functional component.  \nClass components are ES6 classes that extend from ‘React.Component’ and can hold and manage local state and lifecycle methods. On the other hand, Functional components are simpler and primarily used for rendering UI without handling state or lifecycle methods, although with React Hooks, they are now capable of using both.  \n6. How do you create a React component?  \nThere are two main ways to create React components:  \n● Class-based components: These use the class keyword and lifecycle methods to manage state and handle events.  \n● Functional components: These are simpler functions that return JSX code and can leverage React Hooks for managing state and side effects.  \n7. What are Props in React?  \nProps are read-only properties passed down from parent components to child components. They act like arguments, providing data to child components without modifying their internal state.  \nExample:  \n8. What's the difference between Props and State in React?  \n● Props: Read-only data passed down from parent to child components. Used for customization without changing internal state.  \n● State: Internal data managed by a component. State can be changed, making it ideal for keeping track of user inputs, events, and data that changes over time.  \n9. What does the render() method do in React components?  \nThe render() method is essential in class components. It examines this. props and this.state and returns one of the following: React elements, arrays and fragments, portals, string and numbers, Booleans or null. This output represents what should be displayed on the screen.  \n10. What are keys in React and why are they important?  \nKeys are special string attributes that you need to include when creating lists of elements. They help React identify which items have changed, are added, or are removed. Keys should be given to the elements inside the array to give the elements a stable identity, enhancing performance during updates.  \n11. What is an event in React?  \nIn React, an event is similar to events in plain JavaScript—actions like clicks, form submissions, or key presses. React wraps these events in its own SyntheticEvent wrapper to ensure consistency across different browsers.  \n12. How do you handle events in React?  \nHandling events in React is straightforward: you use event handlers. These are functions you write to execute when an eve","cbCaisdoa1eCkCoL","https://ap.wps.com/l/cbCaisdoa1eCkCoL","pdf",774529,16,"English","# Basic ReactJS Interview Questions for Freshers\n## Core React Concepts\n### What is React?\n### What are Components in React?\n### Explain JSX in React\n### Explain the concept of the Virtual DOM\n### Class vs Functional Components\n### Creating a React Component\n### Props in React\n### Props vs State\n### What does render() do?\n### Keys in React\n### Events in React\n### Handling Events in React\n### Stateful vs Stateless Components\n### Passing Data Between Components\n### Controlled Components\n### Updating Component State\n### componentDidMount Lifecycle Method","[{\"question\":\"What is React and what does it help developers do?\",\"answer\":\"React is a JavaScript library for building user interfaces. It uses reusable components that manage their own state and update the UI efficiently.\"},{\"question\":\"What are the key differences between props and state in React?\",\"answer\":\"Props are read-only data passed from parent components to child components for customization. State is internal data managed by a component and can change over time.\"},{\"question\":\"How does React handle events and what is SyntheticEvent?\",\"answer\":\"React handles events using event handlers—functions that run when an event occurs. React wraps events in its SyntheticEvent wrapper to keep behavior consistent across browsers.\"}]","50+ ReactJS Interview Questions 2024 - Common, Basic - Advanced | PDF",1790358542]