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bebo Technologies Reactjs Developer Interview Questions, Process, and Tips

Updated 6 Aug 2024

bebo Technologies Reactjs Developer Interview Experiences

1 interview found

Interview experience
5
Excellent
Difficulty level
Easy
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Recruitment Consulltant and was interviewed in Jul 2024. There were 3 interview rounds.

Round 1 - Technical 

(6 Questions)

  • Q1. What are promises ? D/W Promise.all and Promise.allSettled
  • Q2. D/W let and var
  • Q3. What are callback function ? Give disadvantages
  • Ans. 

    Callback functions are functions passed as arguments to other functions to be executed later.

    • Used in event handling, asynchronous operations, and to achieve higher order functions

    • Disadvantages include callback hell, difficult to read and maintain code, and potential for memory leaks

    • Example: setTimeout function in JavaScript takes a callback function as an argument

  • Answered by AI
  • Q4. D/w useMemo and React.memo
  • Q5. What is shadow DOM ?
  • Ans. 

    Shadow DOM is a way to encapsulate the styling and structure of a web component, preventing styles from leaking out or clashing with the rest of the page.

    • Shadow DOM allows for creating self-contained components with their own DOM tree and styling.

    • It helps in preventing styles from the main document affecting the component and vice versa.

    • Shadow DOM can be created using the 'attachShadow' method in JavaScript.

    • Example: read more

  • Answered by AI
  • Q6. What is redux ? Explain its architecture ? How many parameters are there in connect method ?
  • Ans. 

    Redux is a predictable state container for JavaScript apps. It helps manage application state in a single immutable store.

    • Redux is a state management library for JavaScript applications.

    • It follows a unidirectional data flow architecture.

    • Redux architecture consists of actions, reducers, store, and middleware.

    • Actions are payloads of information that send data from the application to the store.

    • Reducers specify how the app...

  • Answered by AI
Round 2 - Mangerial Round 

(5 Questions)

  • Q1. Brief Introduction and projects that I have worked on
  • Ans. 

    I am a Reactjs Developer with experience in building responsive web applications.

    • Developed a responsive e-commerce website using React, Redux, and Material-UI

    • Implemented authentication and authorization using Firebase in a social media application

    • Optimized performance by lazy loading components and code splitting

  • Answered by AI
  • Q2. What is CORS ?
  • Ans. 

    CORS stands for Cross-Origin Resource Sharing, a security feature that allows servers to specify who can access their resources.

    • CORS is a security feature implemented by browsers to prevent unauthorized access to resources on a different origin.

    • It allows servers to specify which origins are allowed to access their resources using HTTP headers like Access-Control-Allow-Origin.

    • CORS is important for protecting sensitive d...

  • Answered by AI
  • Q3. How can you improve website performance ?
  • Ans. 

    Improving website performance involves optimizing code, reducing server requests, and utilizing caching techniques.

    • Optimize code by removing unnecessary code, minifying and compressing files, and using efficient algorithms.

    • Reduce server requests by combining files, using asynchronous loading, and implementing lazy loading for images and videos.

    • Utilize caching techniques such as browser caching, server-side caching, and...

  • Answered by AI
  • Q4. What tools you have used in your previous organization
  • Ans. 

    I have used tools like Git, Webpack, Babel, ESLint, and Redux in my previous organization.

    • Git for version control

    • Webpack for bundling

    • Babel for transpiling

    • ESLint for code linting

    • Redux for state management

  • Answered by AI
  • Q5. Why you are looking for a change ?
  • Ans. 

    Seeking new challenges and opportunities for growth.

    • Looking for opportunities to work on more complex projects

    • Desire to learn new technologies and expand skill set

    • Seeking a more collaborative team environment

    • Want to advance career and take on more responsibilities

  • Answered by AI
Round 3 - HR 

(1 Question)

  • Q1. Salary Discussion

Interview Preparation Tips

Interview preparation tips for other job seekers - Interview was very simple.
If your basics are strong, you can easily clear it

Skills evaluated in this interview

Interview questions from similar companies

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. What is Event loop
  • Ans. 

    Event loop is a mechanism in JavaScript that allows for asynchronous operations to be executed in a non-blocking way.

    • Event loop is responsible for handling asynchronous operations in JavaScript.

    • It allows for non-blocking execution of code by moving asynchronous tasks to the event queue.

    • Event loop continuously checks the call stack and the event queue, moving tasks from the queue to the stack when the stack is empty.

    • Exa...

  • Answered by AI
  • Q2. What are closures
  • Ans. 

    Closures are functions that have access to their own scope, as well as the scope in which they were defined.

    • Closures allow functions to access variables from their outer scope even after the outer function has finished executing.

    • They are commonly used to create private variables in JavaScript.

    • Closures are created whenever a function is defined within another function.

  • Answered by AI
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

Dsa question were asked

Round 2 - Aptitude Test 

Question related to profit loss

Interview Questionnaire 

3 Questions

  • Q1. What are the new features in react 16?
  • Ans. 

    React 16 introduced new features like React Fiber, Error Boundaries, Portals, and improved server-side rendering.

    • React Fiber is a new reconciliation engine that improves performance and enables incremental rendering.

    • Error Boundaries allow developers to catch and handle errors in components.

    • Portals provide a way to render children into a different DOM subtree.

    • Improved server-side rendering with support for streaming and...

  • Answered by AI
  • Q2. Why react hooks are use full?
  • Ans. 

    React hooks simplify state management and lifecycle methods in functional components.

    • Hooks allow functional components to have state and lifecycle methods

    • They reduce the need for class components and HOCs

    • Hooks make code more readable and easier to test

    • Examples of hooks include useState, useEffect, and useContext

  • Answered by AI
  • Q3. What is HOC components?
  • Ans. 

    HOC components are higher-order components in React that allow code reuse and logic sharing.

    • HOC components are functions that take a component and return a new component with additional functionality.

    • They are used to abstract common logic and behaviors into reusable components.

    • HOC components can be used for tasks like authentication, logging, and code reuse.

    • Example: a withAuth HOC component that adds authentication log

  • Answered by AI

Skills evaluated in this interview

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
No response

I applied via Recruitment Consulltant and was interviewed in Sep 2024. There was 1 interview round.

Round 1 - Technical 

(16 Questions)

  • Q1. What is hosting and closer
  • Ans. 

    Hosting is the process of storing a website or application on a server, while closure is a function that retains access to variables from its parent scope.

    • Hosting involves storing a website or application on a server to make it accessible on the internet.

    • Closure is a function that retains access to variables from its parent scope, even after the parent function has finished executing.

  • Answered by AI
  • Q2. What is difference between var let and const give me an explanation on what block scope
  • Ans. 

    var, let, and const are used to declare variables in JavaScript. var has function scope, let has block scope, and const is a constant with block scope.

    • var has function scope, meaning it is accessible throughout the function it is declared in.

    • let has block scope, meaning it is only accessible within the block it is declared in.

    • const is similar to let in terms of block scope, but the value cannot be reassigned.

  • Answered by AI
  • Q3. What is asynchronous and how it works
  • Ans. 

    Asynchronous programming allows tasks to run independently of the main program flow, improving performance and responsiveness.

    • Asynchronous code does not block the main thread, allowing other tasks to continue while waiting for a response.

    • Callbacks, promises, and async/await are common ways to handle asynchronous operations in JavaScript.

    • Example: fetching data from an API while the rest of the application continues to r

  • Answered by AI
  • Q4. Tell me the output 1)a = 20; console.log(a); var a; 2)b=10; console.log(b); let b; 3)let a =5; if(a<5){ let b = " a lessthen 5"; }else{ let b = "b is grater then 5"; } console.log(b);
  • Ans. 

    The output for the given code snippets will be: 1) 20 2) ReferenceError: Cannot access 'b' before initialization 3) ReferenceError: b is not defined

    • In the first snippet, variable 'a' is declared using 'var' after it is assigned a value, so it logs 20 without any issues.

    • In the second snippet, variable 'b' is declared using 'let' after it is assigned a value, so it throws a ReferenceError as 'b' is accessed before initia...

  • Answered by AI
  • Q5. Give a div with text and display center of the page and apply animation using HTML and css
  • Ans. 

    Use HTML and CSS to center a div with text and apply animation

    • Create a div element with text inside

    • Apply CSS to center the div on the page using flexbox or margin auto

    • Use CSS animations like keyframes to add animation effects

  • Answered by AI
  • Q6. What are semantic tags and explain
  • Ans. 

    Semantic tags are HTML tags that provide meaning to the content they enclose, helping search engines and screen readers understand the structure of a webpage.

    • Semantic tags help improve SEO by providing context to search engines.

    • They also improve accessibility for screen readers by clearly defining the structure of a webpage.

    • Examples of semantic tags include

      ,
      ,

  • Answered by AI
  • Q7. How can we write responsive for web page
  • Ans. 

    Use media queries, flexible grids, and relative units to create a responsive web page.

    • Use media queries to apply different styles based on screen size

    • Create flexible grids using CSS Grid or Flexbox

    • Use relative units like percentages or ems for sizing elements

    • Consider using frameworks like Bootstrap or Material-UI for responsive design

    • Test your design on different devices and screen sizes

  • Answered by AI
  • Q8. What is the difference between CSS and SASS? what is the use of Sass
  • Ans. 

    SASS is a preprocessor scripting language that is interpreted into CSS, offering more features and flexibility.

    • SASS is a preprocessor for CSS, allowing for variables, nesting, and mixins to be used in stylesheets.

    • SASS code needs to be compiled into CSS before being used in a web project.

    • SASS helps in writing cleaner and more organized CSS code, making it easier to maintain and update styles.

    • CSS is the styling language ...

  • Answered by AI
  • Q9. Event propagation
  • Q10. How would you validate the form using HTML? How do you validate the phone number with the country code?
  • Ans. 

    Form validation using HTML and validating phone number with country code

    • Use HTML5 form validation attributes like 'required', 'pattern', 'minlength', etc.

    • For phone number validation, use 'pattern' attribute with regex for specific country code format

    • Example: <input type='tel' pattern='[0-9]{3}-[0-9]{3}-[0-9]{4}' required>

  • Answered by AI
  • Q11. Which test library you use why it usecase
  • Ans. 

    I use Jest for testing React applications due to its simplicity and integration with React ecosystem.

    • Jest is the most popular test library for React applications

    • It comes pre-configured with Create React App and has great support for snapshot testing

    • Jest also has built-in mocking capabilities which make it easy to test components with dependencies

  • Answered by AI
  • Q12. Tell me mounting and shallow concept in testing library
  • Ans. 

    Mounting is the process of rendering a component into the DOM, while shallow rendering allows testing a component without rendering its children.

    • Mounting is the initial phase of the component lifecycle where the component is rendered into the DOM.

    • Shallow rendering in testing library renders only the component itself, not its children.

    • Shallow rendering is useful for isolating the component being tested and avoiding rend...

  • Answered by AI
  • Q13. What is redux-toolkit and what difference b/w redux and redux-toolkit
  • Ans. 

    Redux Toolkit is the official, recommended way to write Redux logic. It simplifies the process of managing state in React applications.

    • Redux Toolkit provides a set of tools and best practices to streamline Redux development.

    • It includes utilities like createSlice, createReducer, and configureStore to simplify the code and reduce boilerplate.

    • Redux Toolkit also includes built-in Immer integration for writing immutable upd...

  • Answered by AI
  • Q14. How api call handle in redux and how can you get and display user name from redux
  • Ans. 

    API calls in Redux are typically handled using middleware like Redux Thunk. User name can be retrieved from Redux state and displayed in components.

    • Use Redux Thunk middleware to make API calls in Redux

    • Dispatch actions to update Redux state with API response data

    • Access user name from Redux state in components to display it

  • Answered by AI
  • Q15. React hooks and how optimization
  • Q16. Why we need thank in redux
  • Ans. 

    Thunk middleware in Redux allows for asynchronous logic to be handled in Redux actions.

    • Thunk middleware allows for dispatching functions instead of just plain objects in Redux actions.

    • It enables handling asynchronous API calls within Redux actions.

    • Thunk middleware helps in simplifying the code by moving complex logic outside of components.

    • Example: Thunk middleware can be used to dispatch an action after a delay or to f...

  • Answered by AI

Skills evaluated in this interview

Reactjs Developer Interview Questions & Answers

LTIMindtree user image Abdul Munaf Mohammed

posted on 15 Oct 2024

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(3 Questions)

  • Q1. React VirtualDOM
  • Q2. ReactJS questions
  • Q3. Inline vs block
  • Ans. 

    Inline elements flow in the same line, while block elements take up the full width available.

    • Inline elements do not start on a new line and only take up as much width as necessary.

    • Block elements start on a new line and take up the full width available.

    • Examples of inline elements include <span>, <a>, and <strong>.

    • Examples of block elements include <div>, <p>, and <h1>.

  • Answered by AI

Skills evaluated in this interview

I applied via LinkedIn and was interviewed in Jun 2021. There was 1 interview round.

Interview Questionnaire 

4 Questions

  • Q1. What is hoisting ?
  • Ans. 

    Hoisting is a JavaScript mechanism where variables and function declarations are moved to the top of their scope.

    • Variables declared with var are hoisted to the top of their scope

    • Function declarations are hoisted before variables

    • Function expressions are not hoisted

    • Hoisting can lead to unexpected behavior and bugs

  • Answered by AI
  • Q2. What is useEffect ?
  • Ans. 

    useEffect is a hook in React that allows you to perform side effects in functional components.

    • It replaces componentDidMount, componentDidUpdate, and componentWillUnmount.

    • It takes two arguments: a function that performs the side effect and an array of dependencies.

    • The function is called after every render, unless the dependencies haven't changed.

    • Common use cases include fetching data, setting up event listeners, and upd...

  • Answered by AI
  • Q3. What is function currying
  • Ans. 

    Function currying is a technique of transforming a function that takes multiple arguments into a sequence of functions that each take a single argument.

    • Currying allows partial application of a function.

    • It helps in creating reusable functions.

    • Curried functions are composable and can be easily combined to create new functions.

    • Currying can be achieved using closures or by using libraries like Lodash or Ramda.

    • Example: cons

  • Answered by AI
  • Q4. What is closures in js
  • Ans. 

    Closures are functions that have access to variables in their outer scope, even after the outer function has returned.

    • Closures are created when a function is defined inside another function.

    • The inner function has access to the outer function's variables and parameters.

    • Closures can be used to create private variables and methods.

    • Closures can also be used to create functions with pre-set arguments.

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - Only a single round which lasted for almost 30 min. It was relatively easy one with basic qns on javascript

Skills evaluated in this interview

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - HR 

(1 Question)

  • Q1. Questions related to Current Job Profile and previous experience
Interview experience
3
Average
Difficulty level
Moderate
Process Duration
4-6 weeks
Result
No response

I applied via Recruitment Consulltant and was interviewed in Oct 2022. There were 3 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all Resume tips
Round 2 - Technical 

(1 Question)

  • Q1. First Round is telephonic. Self -introduction, and basics of React js
Round 3 - Technical 

(1 Question)

  • Q1. Second round is video interview. life cycle of react js, dom manipulations, HOC, Redux, React memo, props drilling Javascript: array cloning, object cloning, Data types, Nan

I applied via Recruitment Consulltant and was interviewed in Mar 2022. There was 1 interview round.

Round 1 - Technical 

(6 Questions)

  • Q1. What is hoisting in JS
  • Ans. 

    Hoisting is a JavaScript behavior where variable and function declarations are moved to the top of their containing scope.

    • Hoisting applies to both variable and function declarations.

    • Variable declarations are hoisted but not their initializations.

    • Function declarations are fully hoisted, allowing them to be called before they are declared.

    • Hoisting does not apply to variables declared with let or const.

    • Hoisting can lead t...

  • Answered by AI
  • Q2. What are higher-order functions in JS
  • Ans. 

    Higher-order functions are functions that take one or more functions as arguments or return a function as their result.

    • Higher-order functions can be used to create reusable code by abstracting common patterns.

    • They enable functional programming paradigms like currying and composition.

    • Examples of higher-order functions in JavaScript include map, filter, and reduce.

  • Answered by AI
  • Q3. Difference between var, let, and const in JS
  • Ans. 

    var is function scoped, let and const are block scoped.

    • var can be redeclared and updated within its scope

    • let can be updated but not redeclared within its scope

    • const cannot be updated or redeclared once declared

    • let and const are not hoisted like var

    • const must be initialized during declaration

  • Answered by AI
  • Q4. What are Hooks in React.js
  • Ans. 

    Hooks are a feature in React.js that allow developers to use state and other React features in functional components.

    • Hooks are functions that let you use React features in functional components

    • They allow you to use state and other React features without writing a class

    • Hooks provide a way to reuse stateful logic between components

    • Some commonly used hooks are useState, useEffect, and useContext

  • Answered by AI
  • Q5. Presentation component vs functional component in React.js
  • Q6. Bind(), call(), apply() in JS

Interview Preparation Tips

Topics to prepare for Infosys Reactjs Developer interview:
  • JavaSctipt
  • React.Js
Interview preparation tips for other job seekers - the interview was based on basic concepts of JS.

Skills evaluated in this interview

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bebo Technologies Interview FAQs

How many rounds are there in bebo Technologies Reactjs Developer interview?
bebo Technologies interview process usually has 3 rounds. The most common rounds in the bebo Technologies interview process are Technical and HR.
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Some of the top questions asked at the bebo Technologies Reactjs Developer interview -

  1. What is redux ? Explain its architecture ? How many parameters are there in con...read more
  2. What are callback function ? Give disadvanta...read more
  3. How can you improve website performanc...read more

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