KocharTech Mern Full Stack Developer Interview Questions, Process, and Tips

Q1. Duplicate value in a array
Ans. 
Finding duplicate values in an array of strings
• Iterate through the array and store each element in a hash set

• If an element is already in the hash set, it is a duplicate

• Return the duplicate values found
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Q1. Generators In Javascript
Ans. 
Generators in JavaScript are functions that can be paused and resumed, allowing for asynchronous programming.
• Generators are defined using function* syntax.

• They use the yield keyword to pause execution and return a value.

• Generators can be iterated over using a for...of loop.

• They are commonly used for asynchronous operations and managing state.
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Q2. Flatten a array without using inbuild functions
Ans. 
Flatten an array without using inbuilt functions
• Create a recursive function to iterate through the array elements

• Check if each element is an array, if so, call the function recursively

• Concatenate the elements into a new array
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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. Cache implementation in spring boot
Ans. 
Spring Boot provides support for caching through annotations like @Cacheable, @CacheEvict, @CachePut.
• Use @EnableCaching annotation to enable caching in Spring Boot application

• Use @Cacheable annotation to cache the result of a method

• Use @CacheEvict annotation to remove entries from the cache

• Use @CachePut annotation to update the cache without interfering with the method execution
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Q2. Few coding questions
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Q1. 1)Core java concepts - encapsulation, inheritance, polymorphism, Abstration 2)Option class methods 3) Objcet methods 4)Java method reference. 5) Design Patterns
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Q1. Design Patten, Rest APIs, Spring boot Configuration, Angular application testing strategy, AOT and JIT Diff
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Q1. Tell me about yourself?
Ans. 
I am a passionate Mern Full Stack Developer with experience in building web applications using React, Node.js, and MongoDB.
• Experienced in developing responsive web applications using React, HTML, CSS, and JavaScript

• Proficient in backend development with Node.js and Express

• Skilled in database management with MongoDB

• Familiar with version control systems like Git and deployment tools like Heroku

• Strong problem-solving and
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Q2. Javascript basic coding outputs
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Q1. Salary discussion
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Q2. Job Re allacoation
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Q1. Based on technical stuffs
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Q2. Given one system test
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Q1. Dependecy injection
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Q2. Components of dot net framework
Ans. 
The components of the .NET framework include Common Language Runtime (CLR), Base Class Library (BCL), and Framework Class Library (FCL).
• Common Language Runtime (CLR) - manages code execution and provides services such as memory management and exception handling

• Base Class Library (BCL) - provides a set of reusable classes, interfaces, and value types

• Framework Class Library (FCL) - a collection of reusable classes, inter...read more
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SOLID, API Security, Git commands, Node.js basics