Cognizant Front end Web Developer Interview Questions and Answers

Html,css,javascript,reactjs,php,laravel.bootstrap

Q1. Why we use reactjs? and javascript
Ans. 
ReactJS is used for building interactive user interfaces, while JavaScript is the programming language that powers web development.
• ReactJS allows for component-based architecture, making it easier to manage and update UI elements.

• ReactJS uses a virtual DOM for efficient rendering, improving performance.

• JavaScript is the language used to add interactivity and dynamic behavior to web pages.

• JavaScript is essential for cli...read more
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Q2. This is use fro single page web aplication or real time.
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Q1. It was a array question. I was told to return a object from a function which would contain getting all the array elements, adding a element, deleting a element. The test was on hacker rank.
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Q1. This was basically a one on one round. I was asked basics of HTML, CSS and React. Questions like Hoisting, Prop Drilling, Context API. Not only do you need to know what the topics are. But I was asked to i...read more
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Q1. Basic Company Details and Salary Negotiations
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Q1. What is react and it's advantage
Ans. 
React is a JavaScript library for building user interfaces.
• React allows for the creation of reusable UI components

• It uses a virtual DOM for efficient rendering

• React is declarative, making it easier to understand and debug code
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Q2. React life cycle
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Q3. Questions related to Redux
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Q4. Simple app using redux
Ans. 
Creating a simple app using Redux for state management in a front end application.
• Set up Redux store with reducers and actions

• Connect components to Redux store using mapStateToProps and mapDispatchToProps

• Dispatch actions to update state in Redux store

• Use combineReducers to manage multiple reducers
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Q1. Previous project
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Q2. Agile process followed in project
Ans. 
Agile process involves iterative development, frequent collaboration, and adaptability to changes.
• Daily stand-up meetings to discuss progress and roadblocks

• Sprints for focused development and testing

• Continuous feedback and iteration based on user input

• Use of tools like Jira or Trello for project management
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Q1. Salary discussion
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Q2. Work location discussion
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2 question 1 easy 2 medium dsa

2 codes of dsa and mcq.

Q1. Code paring round
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Q2. Dsa question of graph
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Kasineni venkata Sai Mukesh

Q1. Create a frame by using python
Ans. 
Creating a frame using Python involves using loops to print characters in a specific pattern.
• Use nested loops to print characters in the desired pattern

• Determine the dimensions of the frame (rows and columns)

• Print characters based on the position in the loop
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Q2. Create a profile by using css and java script
Ans. 
Create a profile using CSS and JavaScript
• Use CSS to style the profile layout

• Use JavaScript to add interactive elements like buttons or animations

• Include a profile picture, name, bio, and contact information

• Add hover effects or transitions for a polished look
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Q3. What are the key responsibilities of Web Developers?
Ans. 
Key responsibilities of Web Developers include designing, coding, and maintaining websites, as well as collaborating with clients and team members.
• Designing and developing websites using programming languages such as HTML, CSS, and JavaScript

• Ensuring websites are responsive and optimized for various devices

• Collaborating with clients to understand their requirements and provide solutions

• Testing and debugging websites to...read more
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Q4. List the advantages of HTTP/2 over HTTP 1.1.
Ans. 
HTTP/2 offers several advantages over HTTP 1.1, including improved performance and efficiency.
• Multiplexing: HTTP/2 allows multiple requests and responses to be sent and received at the same time over a single connection, improving efficiency.

• Header compression: HTTP/2 uses HPACK compression for headers, reducing overhead and improving performance.

• Server push: HTTP/2 allows servers to push resources to the client before...read more
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Q5. What do you mean by ETag (Entity Tag) and how does it work?
Ans. 
ETag is an HTTP header used for web caching to determine if a resource has changed.
• ETag is a unique identifier assigned to a specific version of a resource on the web server.

• When a client requests a resource, the server sends the ETag along with the resource.

• The client can then use the ETag in subsequent requests to check if the resource has been modified.

• If the ETag matches the current version of the resource on the s...read more
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Javascript,Angular,Angular Js questions

Q1. Javascript, Angular questions
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Q1. What is Virtual dom?
Ans. 
Virtual DOM is a lightweight copy of the actual DOM in memory, used for efficient updates and rendering in web development.
• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing actual DOM manipulations.

• When changes are made to the UI, the virtual DOM is updated first, then compared to the actual DOM to determine the minimal changes needed.

• This process helps reduce the number of upd...read more
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Q1. Why should we hire you?
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