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Selvi Software Technologies React Js Frontend Developer Interview Questions and Answers
Selvi Software Technologies React Js Frontend Developer Interview Experiences
1 interview found
Nathiya.M
I applied via Walk-in and was interviewed in Dec 2023. There was 1 interview round.
(2 Questions)
- Q1. Definition react js
- Ans.
React JS is a JavaScript library for building user interfaces.
React JS is used for creating interactive user interfaces for web applications.
It allows developers to create reusable UI components.
React uses a virtual DOM for efficient rendering of components.
React follows a unidirectional data flow, making it easier to manage state.
- Q2. What is redux and explanation
- Ans.
Redux is a predictable state container for JavaScript apps.
Redux is a state management library for JavaScript applications.
It helps in managing the state of the application in a predictable way.
Redux follows a unidirectional data flow pattern.
Actions are dispatched to update the state in the store.
Reducers specify how the state should change in response to actions.
Components can subscribe to the store to access the sta...
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Murshid Alam
Selected
I applied via Approached by Company and was interviewed in Jul 2024. There were 2 interview rounds.
CBT-based assessments in aptitude and pseudocode for the MCA program.
(5 Questions)
- Q1. React development basic questions
- Q2. Basic html, css, js
- Q3. Basic JSX and introduction of react
- Q4. Basic state management like useState, useeffect, usecontext
- Q5. Redux for global state management
Interview Preparation Tips
React Js Frontend Developer Interview Questions & Answers
Microsoft Corporation
Anonymous
posted on 28 May 2024
I applied via Approached by Company and was interviewed in Nov 2023. There were 2 interview rounds.
(1 Question)
- Q1. DSA related to binary search
(1 Question)
- Q1. System Design for elevator
- Ans.
System design for elevator
Consider the number of floors in the building
Think about the capacity of the elevator
Design algorithms for efficient movement of the elevator
Include safety features such as emergency stop
Consider user interface for passengers
Interview Preparation Tips
Skills evaluated in this interview
(1 Question)
- Q1. JavaScript deep concept, React coding , LifeCycle
I applied via Company Website and was interviewed before Jun 2023. There were 2 interview rounds.
Round 1 was the aptitude test and it went amazing
The second one was a coding test in which they asked DSA and basic frontend
I applied via Company Website and was interviewed in Sep 2021. There was 1 interview round.
Interview Questionnaire
16 Questions
- Q1. What are the features of html 5
- Ans.
HTML5 is the latest version of HTML with new features like video/audio support, canvas for graphics, local storage, and semantic elements.
Video and audio support
Canvas for graphics
Local storage
Semantic elements
- Q2. What is a css box model
- Ans.
CSS box model is a design concept that describes how elements are rendered on a web page.
It consists of content, padding, border, and margin.
Content is the actual element content.
Padding is the space between the content and the border.
Border is the line that surrounds the content and padding.
Margin is the space between the border and the next element.
The box model can be adjusted using CSS properties such as padding, b...
- Q3. What is prototype chaining
- Ans.
Prototype chaining is the mechanism by which objects inherit properties and methods from their prototype.
Every object in JavaScript has a prototype property that refers to another object.
If a property or method is not found on an object, JavaScript looks for it in the object's prototype chain.
Prototype chaining can be used to create inheritance in JavaScript.
Modifying the prototype of an object affects all objects that
- Q4. What's are the features of react
- Ans.
React is a JavaScript library for building user interfaces.
Declarative approach to building UI
Component-based architecture
Virtual DOM for efficient updates
JSX syntax for writing HTML in JavaScript
One-way data binding
Support for server-side rendering
Large and active community
Integration with other libraries and frameworks
- Q5. What are media elements
- Ans.
Media elements are HTML tags used to embed multimedia content like images, videos, and audio files on a webpage.
Media elements include ,
They allow for the display of images, videos, and audio files on a webpage
Attributes like src, alt, and controls are used to customize media elements
- Q6. What is same origin property
- Ans.
Same Origin Policy is a security feature in web browsers that restricts web pages from making requests to a different domain.
It prevents malicious scripts from accessing sensitive data from other websites
It applies to all web content, including JavaScript, CSS, and images
Cross-Origin Resource Sharing (CORS) is used to bypass the Same Origin Policy
Example: A script from www.example.com cannot access data from www.anothe
- Q7. Explain redux
- Ans.
Redux is a predictable state container for JavaScript apps.
Redux is a library for managing application state.
It provides a single source of truth for the entire application state.
Redux follows a unidirectional data flow pattern.
Actions are dispatched to update the state, which triggers a re-render of the UI.
Redux can be used with React, Angular, Vue, and other frameworks.
- Q8. Explain thunk
- Ans.
Thunk is a function that delays the evaluation of an expression.
A thunk is a function that wraps an expression to delay its evaluation.
It is commonly used in Redux to handle asynchronous actions.
Thunks are used to dispatch actions that return a function instead of an object.
Thunks can be used to handle side effects in React components.
- Q9. What are callbacks
- Ans.
Callbacks are functions passed as arguments to other functions and executed later.
Callbacks are used for asynchronous programming.
They allow a function to be called when an event occurs.
They can be used to handle errors in asynchronous code.
Examples include event listeners and setTimeout() function.
- Q10. Explain promises and it's 3 states
- Ans.
Promises are objects that represent the eventual completion or failure of an asynchronous operation.
Promises have 3 states: pending, fulfilled, or rejected
Pending is the initial state when a promise is created
Fulfilled means the operation completed successfully
Rejected means the operation failed
Promises can be chained using .then() and .catch() methods
- Q11. Basic js output questions
- Q12. React life cycle methods
- Q13. Callback hell
- Q14. Storage on html
- Q15. Worker threads on js
- Ans.
Worker threads allow for parallel execution of JavaScript code in the browser or Node.js environment.
Worker threads can be used to perform CPU-intensive tasks without blocking the main thread.
They can also be used to communicate between different scripts or modules.
In Node.js, worker threads can be created using the 'worker_threads' module.
In the browser, worker threads can be created using the 'Worker' constructor.
Exa...
- Q16. And I was asked to create a very basic input with toggle that print on the screen when in ON position what we enter in the input
Interview Preparation Tips
Skills evaluated in this interview
Selected
I applied via Approached by Company and was interviewed in Jul 2024. There were 2 interview rounds.
CBT-based assessments in aptitude and pseudocode for the MCA program.
(5 Questions)
- Q1. React development basic questions
- Q2. Basic html, css, js
- Q3. Basic JSX and introduction of react
- Q4. Basic state management like useState, useeffect, usecontext
- Q5. Redux for global state management
Interview Preparation Tips
React Js Frontend Developer Interview Questions & Answers
Microsoft Corporation
Anonymous
posted on 28 May 2024
I applied via Approached by Company and was interviewed in Nov 2023. There were 2 interview rounds.
(1 Question)
- Q1. DSA related to binary search
(1 Question)
- Q1. System Design for elevator
- Ans.
System design for elevator
Consider the number of floors in the building
Think about the capacity of the elevator
Design algorithms for efficient movement of the elevator
Include safety features such as emergency stop
Consider user interface for passengers
Interview Preparation Tips
Skills evaluated in this interview
I applied via Referral and was interviewed in Aug 2024. There were 2 interview rounds.
(3 Questions)
- Q1. Small Javascript coding questions
- Q2. Basic html and css questions
- Q3. Questions about last companies project
(2 Questions)
- Q1. JS coding questions, output based questions
- Q2. 2 html questions
Interview Preparation Tips
Akleem Ahmad
Selected
I applied via Naukri.com and was interviewed in Sep 2023. There were 3 interview rounds.
(2 Questions)
- Q1. Hr asked about total experience
- Ans. 2 years of experience in react native developer
- Q2. Hr asked about current CTC and expectations and availablity for joining technical round
- Ans. Telling her my expectation and current CTC and time for join the interview
(2 Questions)
- Q1. What is state ,props, redux, asyncstorage,how to upload a build on test flight
- Ans.
State, props, Redux, AsyncStorage are key concepts in React Native. Uploading a build on TestFlight involves creating an IPA file and using Xcode.
State is used to manage data within a component and can be updated using setState.
Props are read-only data passed from parent to child components.
Redux is a state management library for managing application state.
AsyncStorage is a simple, unencrypted, asynchronous, persistent...
- Q2. He assisted my same task on js like what is output of following questions and ask difference between map, forEach, for loop etc
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