Priya Bagde ⭐’s Post

Priya Bagde ⭐ Really liked the way the concept was explained as a conversation. My $0.02 more on the low level technical design front: - The concept is similar to an Event Bus or Notification center. - Creators act as subscriptions, or API exposed by redux and reducers as the handlers - Store holds the state and provides subscription capabilities for peers to listen to events in redux core. This enables flexible inter-component communication - Dispatch emits an event or produces an event - When Redux receives the event it maps it to creators which are backed by reducers - A dispatch can result in direct state change or could just be used as a communication bridge to communicate with parent components which use store subscription (subscribers can in turn perform state change) - Middleware is simply an application of chain of responsibility with flow transfer to next in chain by previous and acts as enrichers. This is similar to application of template based design where execution order is defined by framework and extensibility for the same is provided to developers to provide their own Middleware and Reducer implementations

🚀 Are you gearing up for a React JS interview? Here are some tricky questions to sharpen your skills! 💡 Question: Explain the difference between props and state in React. How would you decide when to use each? Answer: Props: Props (short for properties) are inputs to a React component. They are passed from parent components to child components and are immutable (cannot be changed within the component). Props are used to pass data and configuration settings from one component to another. Use props when you have data that needs to be passed from a parent component to a child component. State: State is an internal data storage mechanism in React components. It represents the current state of the component and can be updated using the setState method. State is mutable and managed internally by the component. Use state when you have data that will change over time within a component, such as user input or component-specific data. Question: Describe the lifecycle methods of a React component and when each one is called during the component's lifecycle. Answer: Mounting Phase: constructor(): Called when a component is initialized. render(): Renders the component's UI. componentDidMount(): Called after the component is rendered for the first time. Ideal for initializing data fetching or integrating with external libraries. Updating Phase: shouldComponentUpdate(): Determines if the component should re-render. Helps in optimizing performance by preventing unnecessary renders. render(): Re-renders the component's UI. componentDidUpdate(): Called after the component is re-rendered. Useful for performing side effects after an update. Unmounting Phase: componentWillUnmount(): Called before the component is removed from the DOM. Used for cleanup operations like removing event listeners or cancelling network requests. Question: What are React hooks, and how do they differ from class components? Discuss the most commonly used hooks and their purposes. Answer: React hooks are functions that enable functional components to use state and other React features without writing a class. They provide a more concise and readable way to manage state and side effects in React components. The most commonly used hooks include: useState: Manages state within functional components. useEffect: Performs side effects in functional components (e.g., data fetching, subscriptions). useContext: Accesses React context within functional components. useReducer: Alternative to useState for managing complex state logic. useCallback and useMemo: Memoizes functions and values to optimize performance. useRef: Creates a mutable ref object that persists for the lifetime of the component. #reactjs #codinginterview #javascript #frontenddevelopment #techinterview #reacthooks #softwareengineering #reactdeveloper #programmingquestions #interviewprep

Preparing for React/Redux Interviews: State Management Key Concepts and Tools For interviews focused on React JS, Next JS, or React Native, you need to understand state management with Redux and Redux Toolkit (RTK). These tools help keep your application's state predictable and easy to manage. Common Interview Questions Benefits of createSlice() in Redux Toolkit Answer: createSlice() simplifies code by combining action creators and reducers, reducing boilerplate. Main Features of Redux Toolkit Answer: Includes createSlice(), configureStore(), and createAsyncThunk(), making state management easier with less code. Middleware in Redux Answer: Middleware intercepts actions before they reach the reducer. Examples: redux-thunk for async actions, redux-logger for logging actions. Action Creators vs. Action Types Answer: Action types are constants representing action types. Action creators are functions that create action objects. Core Principles of Redux Answer: Actions: Events that describe changes. Reducers: Functions that handle state changes. Store: Central state container. Why Prefer RTK Over Traditional Redux Answer: RTK reduces boilerplate and includes best practices and useful tools out of the box. Time-travel Debugging with Redux DevTools Answer: Lets you step through actions to see how state changes over time. Redux Middleware Examples Answer: redux-thunk for async logic, redux-saga for more complex async flows. Redux Selector Answer: Functions that extract specific parts of the state, making state access easier and more efficient. Role of Reducers in Redux Answer: Define how state changes in response to actions. What is Redux? Answer: A state management library for React that helps manage state in a predictable way. Drawbacks of Overusing Redux Answer: Adds unnecessary complexity to small applications. Use React's state for simpler cases. Immutability in Redux Answer: Ensures state changes produce new state objects, preventing direct modifications. Data Flow in a Redux Application Answer: Actions are dispatched, middleware processes actions, reducers update the state, components access the updated state. Redux Store vs. React Component State Answer: Redux store is a global state container, while component state is local to individual components. Redux Thunk vs. Redux Saga Answer: redux-thunk handles async logic in action creators. redux-saga uses generator functions for more complex async flows.

My Past Interview Experience on Promise.all !! Interviewer: Can you explain what Promise.all does in JavaScript. Me: Okay, 𝐏𝐫𝐨𝐦𝐢𝐬𝐞.𝐚𝐥𝐥 𝐢𝐬 𝐥𝐢𝐤𝐞 𝐩𝐮𝐭𝐭𝐢𝐧𝐠 𝐚𝐥𝐥 𝐲𝐨𝐮𝐫 𝐞𝐠𝐠𝐬 𝐢𝐧 𝐨𝐧𝐞 𝐛𝐚𝐬𝐤𝐞𝐭. It takes an array of promises and waits for all of them to be resolved. If one promise fails, the whole thing fails. Interviewer: How does it handle errors. Me: If any promise in the array rejects, Promise.all immediately rejects with that error, and the remaining promises' results are ignored. Interviewer: Can you give an example of its usage. Me: 𝐈𝐦𝐚𝐠𝐢𝐧𝐞 𝐲𝐨𝐮'𝐫𝐞 𝐥𝐨𝐚𝐝𝐢𝐧𝐠 𝐦𝐮𝐥𝐭𝐢𝐩𝐥𝐞 𝐢𝐦𝐚𝐠𝐞𝐬 𝐨𝐧 𝐚 𝐰𝐞𝐛𝐩𝐚𝐠𝐞. 𝐘𝐨𝐮’𝐝 𝐮𝐬𝐞 𝐏𝐫𝐨𝐦𝐢𝐬𝐞.𝐚𝐥𝐥 𝐭𝐨 𝐰𝐚𝐢𝐭 𝐮𝐧𝐭𝐢𝐥 𝐚𝐥𝐥 𝐢𝐦𝐚𝐠𝐞𝐬 𝐚𝐫𝐞 𝐟𝐮𝐥𝐥𝐲 𝐥𝐨𝐚𝐝𝐞𝐝 𝐛𝐞𝐟𝐨𝐫𝐞 𝐝𝐢𝐬𝐩𝐥𝐚𝐲𝐢𝐧𝐠 𝐭𝐡𝐞𝐦. Interviewer: What happens if the array passed to Promise.all is empty? Me: If the array is empty, Promise.all resolves immediately with an empty array, like 𝐚 𝐛𝐚𝐬𝐤𝐞𝐭 𝐰𝐢𝐭𝐡 𝐧𝐨 𝐞𝐠𝐠𝐬. Interviewer: Can Promise.all handle non-promise values. Me: Yes, it will treat non-promise values as already resolved promises. So, if you pass a mix of promises and regular values, it will resolve with an array containing the resolved values. Interviewer: What’s the difference between Promise.all and Promise.allSettled? Me: Promise.all stops as soon as one promise fails, while Promise.allSettled waits for all promises to complete, regardless of their outcomes. So, Promise.allSettled is like checking every egg in the basket to see if it’s good or bad. Interviewer: How does Promise.all improve performance in some scenarios? Me: By running multiple promises concurrently rather than sequentially, Promise.all can significantly speed up tasks like making multiple API calls at once, compared to waiting for each one to finish before starting the next. . . . . If you find my explanation effective, give it a like, and share any observations or suggestions in the comments.     For more insightful content checkout below: 🟦 𝑳𝒊𝒏𝒌𝒆𝒅𝑰𝒏 - https://lnkd.in/dwi3tV83 ⬛ 𝑮𝒊𝒕𝑯𝒖𝒃 - https://lnkd.in/dkW958Tj 🟥 𝒀𝒐𝒖𝑻𝒖𝒃𝒆 - https://lnkd.in/dDig2j75 or Priya Frontend Vlogz 🔷 𝐓𝐰𝐢𝐭𝐭𝐞𝐫 - https://lnkd.in/dyfEuJNt #frontend #javascript #react #reactjs #html #css #typescript #es6 #interviewquestions #interview #interviewpreparation

New Post: Top 50+Nodejs Interview Question and Answer 2024 - https://lnkd.in/gs3WWKfE before you attend Node.JS an interview Prepare for common interview questions which we are going to talk about in this blog.  Before you attempt any interview make sure you should research the company’s background, it will help communication between you and the interviewee. Make sure your GitHub repository has a project and an open-source contribution on it, an empty repository is a sign of a bad developer. Make sure your LinkedIn profile is well maintained too. Show your Leadership skills.  Practice your answering skills with someone else or in front of a mirror Think about your Strengths because these […]Styxor.com Tips before you attend Node.JS an interview Prepare for common interview questions which we are going to talk about in this blog. Before you attempt any interview make sure you should research the company’s background, it will help communication between you and the interviewee.Make sure your GitHub repository has a project and an open-source contribution on it, an empty repository is a sign of a bad developer.Make sure your LinkedIn profile is well maintained too.Show your Leadership skills. Practice your answering skills with someone else or in front of a mirrorThink about your Strengths because these are FAQsMention a specific accomplishment or activity that matches the duty.Give legit, straightforward answers.Carry a duplicate of your resume for each meeting.Make sure are up to date with current info. Node.js is a popular server-side platform used by many companies. If you are preparing for a career change, it’s always a good idea to brush up on your interview skills beforehand. Although there are a few commonly asked Node.js interview questions that you might be aware of, we also recommend you to focus on exclusive Node.js interview questions. We have compiled a list of Node.js interview questions that come up often in interviews and also help you understand the fundamental concepts of Node.js. Beginner’s NodeJS interview questions 1) What is nodeJS NodeJS or node is an open-source and cross-platform runtime environment that is built on Chrome’s V8 engine (which is written in c++) for executing JavaScript code outside of the browser. JavaScript runs in the browser it can only access your web page but when you allow it to run on your machine with NodeJS we just created a whole new world where js can access the file system, Events, OS, and other systems core module. generally, we use to build back-end services or API also called (application programming interfaces) these are the services that power our client applications like a web app running inside of a web browser or a mobile application. Companies like’s Netflix, LinkedIn, Uber, and many more uses nodeJS js for managing their services. So today jav

My Past Interview Experience on Promise.all !! Interviewer: Can you explain what Promise.all does in JavaScript. Me: Okay, 𝐏𝐫𝐨𝐦𝐢𝐬𝐞.𝐚𝐥𝐥 𝐢𝐬 𝐥𝐢𝐤𝐞 𝐩𝐮𝐭𝐭𝐢𝐧𝐠 𝐚𝐥𝐥 𝐲𝐨𝐮𝐫 𝐞𝐠𝐠𝐬 𝐢𝐧 𝐨𝐧𝐞 𝐛𝐚𝐬𝐤𝐞𝐭. It takes an array of promises and waits for all of them to be resolved. If one promise fails, the whole thing fails. Interviewer: How does it handle errors. Me: If any promise in the array rejects, Promise.all immediately rejects with that error, and the remaining promises' results are ignored. Interviewer: Can you give an example of its usage. Me: 𝐈𝐦𝐚𝐠𝐢𝐧𝐞 𝐲𝐨𝐮'𝐫𝐞 𝐥𝐨𝐚𝐝𝐢𝐧𝐠 𝐦𝐮𝐥𝐭𝐢𝐩𝐥𝐞 𝐢𝐦𝐚𝐠𝐞𝐬 𝐨𝐧 𝐚 𝐰𝐞𝐛𝐩𝐚𝐠𝐞. 𝐘𝐨𝐮’𝐝 𝐮𝐬𝐞 𝐏𝐫𝐨𝐦𝐢𝐬𝐞.𝐚𝐥𝐥 𝐭𝐨 𝐰𝐚𝐢𝐭 𝐮𝐧𝐭𝐢𝐥 𝐚𝐥𝐥 𝐢𝐦𝐚𝐠𝐞𝐬 𝐚𝐫𝐞 𝐟𝐮𝐥𝐥𝐲 𝐥𝐨𝐚𝐝𝐞𝐝 𝐛𝐞𝐟𝐨𝐫𝐞 𝐝𝐢𝐬𝐩𝐥𝐚𝐲𝐢𝐧𝐠 𝐭𝐡𝐞𝐦. Interviewer: What happens if the array passed to Promise.all is empty? Me: If the array is empty, Promise.all resolves immediately with an empty array, like 𝐚 𝐛𝐚𝐬𝐤𝐞𝐭 𝐰𝐢𝐭𝐡 𝐧𝐨 𝐞𝐠𝐠𝐬. Interviewer: Can Promise.all handle non-promise values. Me: Yes, it will treat non-promise values as already resolved promises. So, if you pass a mix of promises and regular values, it will resolve with an array containing the resolved values. Interviewer: What’s the difference between Promise.all and Promise.allSettled? Me: Promise.all stops as soon as one promise fails, while Promise.allSettled waits for all promises to complete, regardless of their outcomes. So, Promise.allSettled is like checking every egg in the basket to see if it’s good or bad. Interviewer: How does Promise.all improve performance in some scenarios? Me: By running multiple promises concurrently rather than sequentially, Promise.all can significantly speed up tasks like making multiple API calls at once, compared to waiting for each one to finish before starting the next. #javascript #promise

🚀 **Top React.js Interview Questions to Prepare For** 🚀 Hey LinkedIn community, If you're preparing for a React.js interview, here are some essential questions that can help you stand out and showcase your expertise: 1. **What is React.js?** ↳ Explain the concept of React and its core features. 2. **What are the key features of React?** ↳ Discuss JSX, Virtual DOM, components, one-way data binding, and performance optimization. 3. **What is JSX?** ↳ Describe JSX and its purpose in React applications. 4. **What are components in React?** ↳ Explain the concept of components, including functional and class components, and their lifecycle methods. 5. **What is the Virtual DOM, and how does it work?** ↳ Discuss the Virtual DOM, its benefits, and how it differs from the real DOM. 6. **What are state and props in React?** ↳ Explain the difference between state and props and their roles in a React component. 7. **What is the purpose of a key in React?** ↳ Discuss why keys are important in lists and how they help React identify which items have changed. 8. **How do you handle forms in React?** ↳ Describe how to create and manage form inputs, including controlled and uncontrolled components. 9. **What are React Hooks?** ↳ Explain the purpose of Hooks, including useState, useEffect, and custom hooks. 10. **How do you optimize a React application?** ↳ Discuss techniques for optimizing performance, such as memoization, lazy loading, and code splitting. 11. **What is Redux, and how does it work with React?** ↳ Describe the state management library Redux, its core concepts (actions, reducers, store), and how it integrates with React. 12. **What is the Context API, and when would you use it?** ↳ Explain the Context API and scenarios where it is beneficial to use over prop drilling. 13. **What are Higher-Order Components (HOCs)?** ↳ Define HOCs and provide examples of their usage in React applications. 14. **How do you handle side effects in React?** ↳ Discuss how to manage side effects using useEffect and other lifecycle methods. 15. **What are some common testing libraries for React applications?** ↳ Mention libraries like Jest, Enzyme, and React Testing Library, and their purposes. 💡 **Bonus Tips:** - Always explain your thought process and reasoning during the interview. - Practice coding challenges and building small projects to solidify your understanding. - Stay updated with the latest React features and best practices. Good luck with your interview preparation! 💪 💬 **Let’s Connect:** If you have other React.js interview questions or experiences, share them in the comments below! ♻️ Repost this to help others in their preparation. And follow Andrew Lokenauth for more tech insights! #ReactJS #InterviewPreparation #WebDevelopment #JavaScript #FrontEndDevelopment #TechCareers !

🚀 Preparing for Your Next React.js Role? Enhance Your Skills with These Key Interview Questions! 🚀 Hello LinkedIn community! 🎉 As you gear up for a React.js interview, it's essential to be well-prepared with the right questions. Here are some crucial topics to help you refresh your knowledge and excel in your interview! 💪 1. What is JSX? Explain how JSX works and its advantages. 2. What are the key differences between state and props? Describe the distinct roles of state and props in React components. 3. How do you manage state in a React application? Discuss various methods like useState, useReducer, and state management libraries such as Redux. 4. Can you explain the virtual DOM and how it differs from the real DOM? Highlight the efficiency and benefits of using the virtual DOM. 5. What are React hooks and why were they introduced? Describe the purpose of hooks and some commonly used ones like useEffect, useContext, and useRef. 6. How do you handle side effects in a React component? Discuss the use of the useEffect hook and its dependencies. 7. What is the Context API and when would you use it? Explain how the Context API allows data to be passed through the component tree without manually passing props. 8. How do you optimize performance in a React application? Talk about techniques such as memoization, code splitting, and lazy loading. 9. What is the significance of keys in React? Explain the importance of keys in lists and the issues that can arise if they are not used correctly. 10. How do you handle form inputs in React? Discuss controlled vs. uncontrolled components and form validation. 11. Can you explain the difference between class components and functional components? Highlight the pros and cons of each, and the shift towards functional components with hooks. 12. What is Redux and how does it help in state management? Describe the core concepts of Redux, including actions, reducers, and the store. 13. What are some common patterns for structuring React applications? Discuss best practices for organizing components, files, and folders. 14. How do you implement routing in a React application? Explain the use of libraries like React Router for handling navigation. 15. What is server-side rendering (SSR) and how does it differ from client-side rendering (CSR)? Discuss the benefits and use cases for SSR in React applications. Feel free to share your favorite React.js interview questions in the comments! Let's support each other's growth and success. 🌟 #ReactJS #InterviewQuestions #WebDevelopment #Frontend #CodingInterview #React #JavaScript #JobPrep #TechCareers #Developer #Programming #TechCommunity #CareerGrowth #SoftwareEngineering #ReactInterview #FrontendDevelopment #CodeNewbie #TechJobs #InterviewPrep #TechIndustry #CodingLife

𝐏𝐚𝐫𝐭- 9️⃣ : 𝐦𝐨𝐬𝐭 𝐜𝐨𝐦𝐦𝐨𝐧 𝐚𝐬𝐤𝐞𝐝 𝐪𝐮𝐞𝐬𝐭𝐢𝐨𝐧 𝐟𝐨𝐫 𝐒𝐃𝐄𝐓 𝐢𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰 🚀 𝐖𝐡𝐚𝐭 𝐰𝐢𝐥𝐥 𝐡𝐚𝐩𝐩𝐞𝐧 𝐢𝐟 𝐰𝐞 𝐝𝐨𝐧’𝐭 𝐨𝐯𝐞𝐫𝐫𝐢𝐝𝐞 𝐫𝐮𝐧 𝐦𝐞𝐭𝐡𝐨𝐝 ❓ When we call start() method on thread, it internally calls run() method with newly created thread. So, if we don’t override run() method newly created thread won’t be called and nothing will happen. class MyThread extends Thread {   //don't override run() method } publicclass DontOverrideRun {   publicstaticvoid main(String[] args) {          System.out.println("𝐦𝐚𝐢𝐧 𝐡𝐚𝐬 𝐬𝐭𝐚𝐫𝐭𝐞𝐝.");          MyThread thread1=new MyThread();          thread1.start();          System.out.println("𝐦𝐚𝐢𝐧 𝐡𝐚𝐬 𝐞𝐧𝐝𝐞𝐝.");   } } /*𝐎𝐔𝐓𝐏𝐔𝐓 𝐦𝐚𝐢𝐧 𝐡𝐚𝐬 𝐬𝐭𝐚𝐫𝐭𝐞𝐝. 𝐦𝐚𝐢𝐧 𝐡𝐚𝐬 𝐞𝐧𝐝𝐞𝐝. */ As we saw in output, we didn’t override run() method that’s why on calling start() method nothing happened. 𝐖𝐡𝐚𝐭 𝐰𝐢𝐥𝐥 𝐡𝐚𝐩𝐩𝐞𝐧 𝐢𝐟 𝐰𝐞 𝐨𝐯𝐞𝐫𝐫𝐢𝐝𝐞 𝐬𝐭𝐚𝐫𝐭 𝐦𝐞𝐭𝐡𝐨𝐝 ❓ When we call start() method on thread, it internally calls run() method with newly created thread. So, if we override start() method, run() method will not be called until we write code for calling run() method. class MyThread extends Thread {   @Override   publicvoid run() {          System.out.println("𝐢𝐧 𝐫𝐮𝐧() 𝐦𝐞𝐭𝐡𝐨𝐝");   }   @Override   publicvoid start(){          System.out.println("𝐈𝐧 𝐬𝐭𝐚𝐫𝐭() 𝐦𝐞𝐭𝐡𝐨𝐝");   } } publicclass OverrideStartMethod {   publicstaticvoid main(String[] args) {          System.out.println("𝐦𝐚𝐢𝐧 𝐡𝐚𝐬 𝐬𝐭𝐚𝐫𝐭𝐞𝐝.");                    MyThread thread1=new MyThread();          thread1.start();                    System.out.println("𝐦𝐚𝐢𝐧 𝐡𝐚𝐬 𝐞𝐧𝐝𝐞𝐝.");   } } /*𝐎𝐔𝐓𝐏𝐔𝐓 𝐦𝐚𝐢𝐧 𝐡𝐚𝐬 𝐬𝐭𝐚𝐫𝐭𝐞𝐝. 𝐈𝐧 𝐬𝐭𝐚𝐫𝐭() 𝐦𝐞𝐭𝐡𝐨𝐝 𝐦𝐚𝐢𝐧 𝐡𝐚𝐬 𝐞𝐧𝐝𝐞𝐝. */ If we note output. we have overridden start method and didn’t called run() method from it, so, run() method wasn’t call. 𝐏𝐚𝐫𝐭- 8️⃣ https://lnkd.in/gvzMgBcW #java #corejava #interview #sdet #automation #qa #testing