Cognizant Frontend Software Developer Interview Questions and Answers

Quantitative aptitude, logical apptiude,

Q1. Data structure and algorithms
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Q2. Programming concepts
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Q1. Frontend developer
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Html, CSS, bootstrap, JavaScript, react.js

Ages, odd numbers, number series, work and time, calendars.

Youth in politics and artificial intelligence.

Q1. How directives are different from component
Ans. 
Directives are used to add behavior to existing DOM elements, while components are used to create new custom elements.
• Directives are used to manipulate the behavior of existing DOM elements, such as changing their appearance or adding event listeners.

• Components are used to create custom elements with their own templates, styles, and behavior.

• Directives can be structural (like ngIf and ngFor) or attribute-based (like ng...read more
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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 compilation.
• Variable and function declarations are hoisted to the top of their scope, regardless of where they are declared in the code.

• Only the declarations are hoisted, not the initializations.

• Function declarations are hoisted before variable declarations.
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Q1. Explain design patterns.
Ans. 
Design patterns are reusable solutions to common problems in software design.
• Design patterns help in creating maintainable, scalable, and efficient code.

• They provide a common language for developers to communicate about solutions to recurring problems.

• Examples of design patterns include Singleton, Factory, Observer, and Strategy patterns.
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Q2. Explain subject. what is replay subject
Ans. 
ReplaySubject is a type of Subject in RxJS that records multiple values and replays them to new subscribers.
• ReplaySubject is a type of Subject in RxJS

• It records multiple values and replays them to new subscribers

• It has a buffer size that determines how many values to replay
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Q1. Salary discussion
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Q1. What are the time queue, etc in API
Ans. 
Time queue in API refers to managing requests in a sequential order.
• Time queue ensures that API requests are processed in the order they are received.

• It helps in preventing overload on the server by limiting the number of concurrent requests.

• Examples include using promises or async/await in JavaScript to handle API calls sequentially.
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Q2. What is the meaning of preflight in API? (All questions are related to dev oops profile. I applied for Angular)
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Time base directions and probability

Q1. Self-introduction of yourself
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Q2. Job description of the company why you need tp work in this company
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We have sit in all the members and will discuss some topics

Q1. What is communication skills what was use in that
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Q2. Tell me about social media
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Q3. What was good in social media
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Q4. What was bad in social media
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Q5. Just tell me about what bad and good
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Q1. What is Virtual Dom
Ans. 
Virtual DOM is a lightweight copy of the actual DOM, used for efficient updates in React applications.
• Virtual DOM is a concept in React where a lightweight copy of the actual DOM is maintained.

• When changes are made to the virtual DOM, React compares it with the actual DOM and only updates the necessary parts.

• This helps in improving performance by minimizing the number of updates to the actual DOM.
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Q2. What is hooks and explain useEffect
Ans. 
Hooks are a new addition in React 16.8 that allow you to use state and other React features without writing a class.
• Hooks are functions that let you use state and other React features in functional components.

• useEffect is a hook that lets you perform side effects in function components.

• It is similar to componentDidMount, componentDidUpdate, and componentWillUnmount in class components.

• useEffect takes two arguments: a f...read more
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