Tech Prescient Software Engineer Interview Questions, Process, and Tips

Given task of creating a simple React todo application

Q1. What are props in React and how are they different from state
Ans. 
Props are used to pass data from parent to child components in React, while state is used to manage data within a component.
• Props are read-only and cannot be modified by the child component

• Props are passed down from parent to child components

• State is mutable and can be changed within the component

• State is managed internally by the component
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Q2. What is purpose of keys in React lists?
Ans. 
Keys in React lists are used to uniquely identify elements and improve performance by helping React identify which items have changed, are added, or are removed.
• Keys help React identify which items have changed, are added, or are removed in a list of elements.

• Keys should be unique among siblings but do not need to be globally unique.

• Using keys improves performance by helping React efficiently update the UI without re-r...read more
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Q3. What is axios and used of interceptors in it?
Ans. 
Axios is a popular JavaScript library for making HTTP requests in web applications. Interceptors are used to intercept and modify HTTP requests and responses.
• Axios is a promise-based HTTP client for the browser and Node.js.

• Interceptors in Axios allow you to run middleware functions before a request is sent or after a response is received.

• Interceptors can be used for logging, authentication, error handling, and more.

• Exa...read more
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Q4. What is useMemo and useCallback hooks
Ans. 
useMemo and useCallback are React hooks used for performance optimization by memoizing values and functions respectively.
• useMemo is used to memoize the result of a function so that it is only recomputed when its dependencies change.

• useCallback is used to memoize a function instance so that it is not recreated on every render unless its dependencies change.

• Both hooks help in optimizing performance by preventing unnecess
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Q5. What are the higher order components?
Ans. 
Higher order components are functions that take a component and return a new component with additional functionality.
• Higher order components are a common pattern in React for code reuse and logic sharing.

• They are used to abstract logic out of components and make them more reusable.

• Examples include withRouter, connect, and withStyles in React.
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Q6. What is callback in JS?
Ans. 
A callback in JS is a function passed as an argument to another function, to be executed later.
• Callback functions are commonly used in event handling, asynchronous programming, and AJAX requests.

• They allow for more flexible and dynamic code execution.

• Example: setTimeout(function(){ console.log('Hello') }, 1000);
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Q1. Explain your past experience
Ans. 
I have 5 years of experience in software development, specializing in web applications and database management.
• Developed web applications using HTML, CSS, JavaScript, and PHP

• Managed databases using MySQL and MongoDB

• Worked on optimizing application performance and scalability

• Collaborated with cross-functional teams to deliver projects on time

• Participated in code reviews and testing processes
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Q2. Why you want leave current company
Ans. 
Seeking new challenges and growth opportunities
• Looking for new challenges to enhance my skills

• Seeking opportunities for career growth and advancement

• Interested in exploring different technologies and industries

• Want to work in a more collaborative team environment

• Current company lacks opportunities for professional development
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