Happiest Minds Technologies Full Stack Software Developer Interview Questions and Answers

Q1. Longest common substring in an array
Ans. 
Find the longest common substring in an array of strings.
• Iterate through each string in the array and compare with all other strings to find common substrings.

• Keep track of the longest common substring found so far.

• Return the longest common substring at the end.
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Q1. Explain Virtual DOM in React
Ans. 
Virtual DOM in React is a lightweight copy of the actual DOM, used for efficient updates and rendering.
• Virtual DOM is a concept where a lightweight copy of the actual DOM is created in memory.

• When changes are made to the UI, React compares the Virtual DOM with the actual DOM to identify the differences.

• React then updates only the necessary parts of the actual DOM, minimizing the number of DOM manipulations for better p...read more
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Q2. How to optimise a React application
Ans. 
Optimising a React application involves code splitting, lazy loading, using memoization, reducing unnecessary re-renders, and optimizing network requests.
• Implement code splitting to load only necessary code for each route or component.

• Use lazy loading to load components only when they are needed, reducing initial load time.

• Utilize memoization techniques like useMemo and useCallback to prevent unnecessary re-renders.

• Avo...read more
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Q1. Questions were on MVC .net
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60 min test including a problem solving question andcMCQs

App development ( Frondend and backend ) for the given use case

30 mins round and 1 coding question

Development of a feature

Q1. What is design pattern
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Q2. Which design pattern have you used
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Aptitude
Logically reasoning
Verbal

Q1. Tell me about yourself 1 coding questions on arrays Few questions on DSA Few questions on DBMS About my project
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Q2. To remove the duplicate elements fromthe array
Ans. 
Use Set data structure to remove duplicate elements from the array.
• Create a Set from the array to automatically remove duplicates.

• Convert the Set back to an array to get the unique elements.

• Example: const array = ['apple', 'banana', 'apple', 'orange'];

• Example: const uniqueArray = [...new Set(array)];
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Q1. Difficulty faced while working on projects About the project
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Q1. It was mainly java, interviewers are very good and supportive to elaborate more about problem.
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Q2. Scenario based on your earlier work experience
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