Cognizant UI Developer Interview Questions and Answers

Q1. Indroduction
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Hii

Q1. About all lifecycle,hooks, virtual Dom questions on react js
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Q2. Explain about Jwt and related token based questions.
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Q3. Redux work flow kind of questions.
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Q4. Java class , interface, abstraction kind of questions.
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JavaScript coding questions using map, filter, reduce.

React hooks coding example s.

Q1. What were ur leaning in ur last project?
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Q2. How was ur role and responsibilities. Questions about development process and testing methods.
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Q3. Are u willing to learn new skills?
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30 min,mathematics,general study

30 min, UI full stack developer

Q1. React State Management
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Q2. State vs Props, Redux, Routing
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Q1. Given UI task display like display boxes side by side in desktop screen and one after the other in mobile screen using media queries?
Ans. 
Use CSS media queries to adjust layout for desktop and mobile screens.
• Use a flexbox or grid layout for desktop to display boxes side by side.

• Example: .container { display: flex; } for desktop view.

• For mobile, use media queries to stack boxes vertically.

• Example: @media (max-width: 768px) { .container { flex-direction: column; } }

• Ensure to test responsiveness on various screen sizes.
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Q2. Explain difference between authorization vs authentication?
Ans. 
Authentication verifies a user's identity, while authorization determines what a user can access.
• Authentication confirms a user's identity through credentials like username and password.

• Authorization controls access to resources based on the authenticated user's permissions.

• Example: Logging into a website (authentication) and then being able to view/edit specific pages based on your role (authorization).
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Q3. How to render list in react? Also explain difference between state vs prop in react?
Ans. 
To render a list in React, use map() function to iterate over an array of data and return a list of components. State is mutable data managed within a component, while props are immutable data passed from parent to child components.
• To render a list in React, use map() function to iterate over an array of data and return a list of components.

• Example: const items = ['item1', 'item2', 'item3']; items.map(item =>

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Q1. What are the webpage optimization techniques? How to check webpage optimization? In lighthouse optimization reports , how to fix issue related render blocking scripts?
Ans. 
Webpage optimization techniques include minifying CSS and JS files, optimizing images, using asynchronous loading for scripts, and reducing render-blocking scripts.
• Minify CSS and JS files to reduce file sizes and improve loading times.

• Optimize images by compressing them and using the correct file format (e.g. JPEG for photographs, PNG for graphics).

• Use asynchronous loading for scripts to prevent them from blocking the ...read more
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Q2. Write scss code nested li element by applying background color 2 element and also use mixins?
Ans. 
Use SCSS to apply background color to nested li elements and utilize mixins.
• Use nesting to target the li elements within a parent element

• Apply background color to the 2nd li element using the :nth-child() selector

• Define and use mixins to reuse styles across the codebase
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Q3. How to fix cumulative layout shift issues?
Ans. 
To fix cumulative layout shift issues, ensure all images and media have dimensions specified in HTML, use CSS aspect ratio boxes, and prioritize loading critical resources.
• Specify dimensions for all images and media in HTML to prevent layout shifts.

• Use CSS aspect ratio boxes to reserve space for images before they load.

• Prioritize loading critical resources to avoid sudden layout changes.
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