LTIMindtree Senior Front end Developer Interview Questions and Answers

It was a hacker coding test mostly javascript questions

Q1. React advance concept
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Q2. Context api how to use that
Ans. 
Context API is a feature in React that allows sharing data between components without having to pass props manually.
• Create a context using createContext() method

• Use the Provider component to wrap the components that need access to the context

• Access the context data using the useContext() hook within the consuming components
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Q3. Higher order component
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Q1. Mainly introduction, how do you manage a project
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Q2. How to debug a code
Ans. 
Debugging a code involves identifying and fixing errors in the code to ensure it runs correctly.
• Use console.log() statements to print out values and check for errors

• Utilize browser developer tools to inspect elements and debug JavaScript

• Step through the code using breakpoints to identify the source of the issue

• Review error messages and stack traces to pinpoint the problem

• Consider using tools like linters and debuggers
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Q3. How to get employee details using group by
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Employee details can be retrieved using group by clause in SQL.
• Use GROUP BY clause in SQL to group employee details based on a specific column

• Aggregate functions like COUNT, SUM, AVG can be used with GROUP BY to get summarized employee details

• Example: SELECT department, COUNT(*) as total_employees FROM employees GROUP BY department
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Q1. General intro to the hr person
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Q1. JS related questions
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Q1. JS related questions
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Q1. JS related questions
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Q1. Output questions on JavaScript.(Array, hoisting, event)
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Q2. Questions on React and Redux
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Q1. React JS and Java script
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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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Basic JS functionality and react coding test

Q1. Explain how have you handled security on websites
Ans. 
Implemented security measures such as HTTPS, input validation, and user authentication to protect websites from attacks.
• Implemented HTTPS to encrypt data transmission between the server and client

• Performed input validation to prevent SQL injection and cross-site scripting attacks

• Implemented user authentication to control access to sensitive information

• Regularly updated security patches and conducted security audits
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Q1. How do you handle stress
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Q1. Basic components communication
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Q2. Forms based questions
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Q1. What is Hositing
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during the compilation phase.
• Variable declarations are hoisted but not their initializations

• Function declarations are fully hoisted

• Hoisting can lead to unexpected behavior if not understood properly
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Q2. What is closure
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Closure is the combination of a function bundled together with references to its surrounding state.
• Closure allows a function to access variables from its outer scope even after the outer function has finished executing.

• It is created whenever a function is defined within another function.

• Closure helps in maintaining the state of a function and allows for data encapsulation.
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