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Anjohn Front Desk Manager Interview Questions and Answers
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1 interview found
Selected
I applied via Referral and was interviewed before May 2023. There was 1 interview round.
(1 Question)
- Q1. Tell me about yourself
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Selected
(5 Questions)
- Q1. React Life cycle
- Q2. What React hooks have you utilized in your projects?
- Q3. What is Redux, and what are the differences between Redux and Context?
- Q4. What is the difference between visibility: hidden and display: none in CSS?
- Q5. What are JavaScript closures, the temporal dead zone (TDZ), hoisting, and the JavaScript engine?
Identify the duplicate character in the string.
React Js Frontend Developer Interview Questions & Answers
Tech Mahindra
Anonymous
posted on 10 Dec 2024
Selected
I applied via Approached by Company and was interviewed in Nov 2024. There were 2 interview rounds.
(2 Questions)
- Q1. Explain Virtual DOM, Key Features of React, Hooks in React, create a todo app in react
- Ans.
Virtual DOM is a lightweight copy of the actual DOM, React key features include component-based architecture, declarative syntax, and virtual DOM, React Hooks are functions that let you use state and other React features without writing a class.
Virtual DOM is a lightweight copy of the actual DOM that React uses to improve performance by updating only the necessary parts of the DOM.
Key features of React include componen...
- Q2. Javascript Questions- Closures,promises,Async/await,setTimeOut, write acode to reverse a string
(2 Questions)
- Q1. Self Introduction, some situation based questions
- Q2. Basic HR regular questions
I applied via Naukri.com and was interviewed in Aug 2024. There were 2 interview rounds.
Online Hackathon test was taken.
(6 Questions)
- Q1. Tell Me About Yourself.
- Ans.
I am a passionate React Js Frontend Developer with experience in building user-friendly and responsive web applications.
Experienced in developing web applications using React Js
Proficient in HTML, CSS, and JavaScript
Familiar with state management libraries like Redux
Strong understanding of responsive design principles
Ability to work collaboratively in a team environment
- Q2. Tell me about your roles and responsibilities in your current project.
- Ans.
I am responsible for developing and maintaining the frontend of the project using React Js.
Developing user-friendly interfaces using React Js
Implementing responsive design and ensuring cross-browser compatibility
Collaborating with backend developers to integrate frontend with backend services
Optimizing application performance and troubleshooting issues
Participating in code reviews and providing feedback to team members
- Q3. How we implement SSR in React.
- Ans.
SSR in React is implemented using server-side rendering to pre-render React components on the server before sending them to the client.
Use libraries like Next.js or Gatsby to implement SSR in React.
Configure server to render React components on the server side.
Optimize server-side rendering for performance by caching rendered components.
- Q4. How can we change our project in production mode from development mode.
- Ans.
To change a React project from development mode to production mode, you need to build the project using the 'npm run build' command.
Run 'npm run build' command in the terminal to create a production build of the project.
This command will generate a 'build' folder with optimized and minified files for production.
You can then deploy the contents of the 'build' folder to a web server for production use.
- Q5. What is lazy loading and how we can implement in our project.
- Ans.
Lazy loading is a technique used to defer loading non-essential resources until they are needed.
Lazy loading helps improve performance by only loading resources when they are required.
In React, lazy loading can be implemented using React.lazy() and Suspense components.
Example: const MyComponent = React.lazy(() => import('./MyComponent'));
Example:
Loading...
React routing is a way to handle navigation in a React application by defining routes and rendering components based on the URL.
React routing allows for declarative routing, where routes are defined using JSX elements.
It enables dynamic routing based on the URL, allowing for different components to be rendered based on the route.
React Router is a popular library for handling routing in React applications.
Unlike convent...
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React Js Frontend Developer Interview Questions & Answers
LTIMindtree
Anonymous
posted on 14 Sep 2024
I applied via Naukri.com and was interviewed in Aug 2024. There was 1 interview round.
(13 Questions)
- Q1. What is closuer? is normal function call as closuer or not
- Ans.
A closure is a function that has access to its own scope, as well as the scope in which it was defined.
A closure allows a function to access variables from its outer function even after the outer function has finished executing.
Closures are created whenever a function is defined within another function.
Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(outerVa
- Q2. What is asyn/await
- Ans.
Async/await is a feature in JavaScript that allows for asynchronous code to be written in a synchronous manner.
Async/await is built on top of promises and provides a more readable and concise way to work with asynchronous code.
The 'async' keyword is used to define a function as asynchronous, allowing it to use the 'await' keyword inside it.
When 'await' is used, it pauses the execution of the function until the promise ...
- Q3. Remove duplicate from array
- Ans.
Use Set to remove duplicates from array of strings.
Create a Set from the array to automatically remove duplicates
Convert the Set back to an array if needed
Example: const arr = ['apple', 'banana', 'apple', 'orange']; const uniqueArr = [...new Set(arr)];
- Q4. Hoe does react Dom update?
- Ans.
React DOM updates by comparing the virtual DOM with the actual DOM and only updating the necessary components.
React creates a virtual DOM to represent the UI components.
When a state or prop changes, React re-renders the virtual DOM.
React then compares the virtual DOM with the actual DOM to identify the differences.
Only the necessary components are updated in the actual DOM, minimizing performance impact.
- Q5. What is react hooks explain some
- Ans.
React Hooks are functions that let you use state and other React features without writing a class.
React Hooks were introduced in React 16.8.
They allow you to use state and other React features in functional components.
Some commonly used hooks are useState, useEffect, useContext, and useRef.
Hooks make it easier to reuse logic across components.
Hooks can be used to manage component state, perform side effects, and more.
- Q6. What is call bind apply?
- Ans.
Call, bind, and apply are methods used to manipulate the value of 'this' in JavaScript functions.
Call - invokes a function with a specified 'this' value and arguments provided individually.
Bind - creates a new function that, when called, has its 'this' keyword set to the provided value.
Apply - invokes a function with a specified 'this' value and arguments provided as an array.
- Q7. What is difference b/w redux and redux toolkit
- Ans.
Redux Toolkit is a set of tools and best practices to simplify Redux development, while Redux is a predictable state container for JavaScript apps.
Redux Toolkit provides a set of tools like createSlice, createAsyncThunk, and configureStore to simplify Redux setup and reduce boilerplate code.
Redux Toolkit includes immer library for writing immutable update logic in a more convenient way.
Redux Toolkit also includes a def...
- Q8. Write a RTL test to check the button
- Ans.
Writing a RTL test to check a button in React
Use the render and fireEvent functions from @testing-library/react
Find the button element using getByRole('button')
Simulate a click event using fireEvent.click
Assert that the button is visible and clickable
- Q9. What inline level and block level elements
- Ans.
Inline and block level elements in HTML/CSS
Inline elements flow in the document in a line, without starting a new line. Examples include , , .
Block level elements start on a new line and take up the full width available. Examples include
,,
.
Answered by AIAdd your answer- Q10. Explain microtasks in js
- Ans.
Microtasks in JavaScript are tasks that are executed asynchronously and have higher priority than regular tasks.
Microtasks are scheduled to run after the current script has finished but before the browser has a chance to render.
They are often used with promises, as promise callbacks are executed as microtasks.
Microtasks are executed in the same event loop iteration as regular tasks, but before the next rendering.
Exampl...
Answered by AIAdd your answer- Q11. Explain customhooks
- Ans.
Custom hooks are reusable functions that allow you to extract component logic into separate functions.
Custom hooks are prefixed with 'use' and can call other hooks if needed.
They can be used to share logic between components without duplicating code.
Custom hooks can be created for any kind of logic, such as fetching data, managing state, or handling side effects.
Answered by AIAdd your answer- Q12. How to manage state using redux
- Ans.
Redux is a predictable state container for JavaScript apps. It helps manage the state of an application in a centralized store.
Create a Redux store to hold the state of the application
Define actions to describe state changes
Write reducers to specify how the state changes in response to actions
Dispatch actions to update the state in the store
Connect components to the Redux store using the connect function from react-red
Answered by AIAdd your answer- Q13. Explain redux work flow
- Ans.
Redux is a predictable state container for JavaScript apps.
Actions are dispatched to the store
Reducers specify how the state changes in response to actions
Store holds the state of the application
Components can subscribe to the store to access state
Answered by AIAdd your answer
Skills evaluated in this interview
(2 Questions)
- Q1. JavaScript Related Questions
- Q2. ReactJs Related Questions
(2 Questions)
- Q1. Reactjs Use Effects and UseRef
- Q2. JavaScript Closures,Map,CallBack
Interview Preparation Tips
(2 Questions)
- Q1. Explain ES6 Concepts
- Q2. Difference between shallow copy and deep copy
(2 Questions)
- Q1. About my project
- Q2. Work flow and all
I was interviewed in Dec 2024.
Ages, odd numbers, number series, work and time, calendars.
Youth in politics and artificial intelligence.
Coding a frontend UI from provided image. And creating a fucntional star rating system
(2 Questions)
- Q1. Designing a Component API in React using Typescript.
- Ans.
Designing a Component API in React using Typescript involves defining props, state, and methods for the component.
Define the props interface to specify the expected input data for the component
Use typescript types to ensure type safety and prevent runtime errors
Define the state interface to manage the internal state of the component
Implement methods to handle user interactions and component logic
Document the component
- Q2. Create a function that can clear all the timer ids at once.
- Ans.
Function to clear all timer ids at once
Create an array to store all timer ids
Iterate through the array and clear each timer id using clearTimeout() function
Skills evaluated in this interview
(2 Questions)
- Q1. What is prop drilling
- Ans.
Prop drilling is the process of passing props down multiple levels of nested components in React.
Prop drilling occurs when a prop needs to be passed through multiple levels of components that do not need the prop themselves.
It can lead to unnecessary passing of props through intermediate components, making the code harder to maintain.
To avoid prop drilling, you can use Context API, Redux, or React's useContext and useR...
- Q2. What is hoisting
- Ans.
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during the compilation phase.
Variable declarations are hoisted to the top of their scope, but not their assignments.
Function declarations are fully hoisted, meaning they can be called before they are declared.
Hoisting can lead to unexpected behavior if not understood properly.
(1 Question)
- Q1. Explain useContext hook
- Ans.
useContext hook allows components to access data from a context without passing props down manually
useContext hook is used to consume a context created by React.createContext
It takes the context object as an argument and returns the current context value for that context
It allows components to subscribe to context changes and re-render when the context value changes
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