Onetech Ventures Interview Questions and Answers

Q1. Write a code to increment counter using redux store
Ans. 
Increment counter using Redux store in Mern Full Stack Developer interview
• Create a Redux action to increment the counter

• Define a Redux reducer to handle the action and update the state

• Connect the component to the Redux store and dispatch the action
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Q2. Flow of redux store
Ans. 
Flow of redux store involves actions being dispatched, reducers updating the state, and components subscribing to the updated state.
• Actions are dispatched by components or middleware

• Reducers receive the actions and update the state immutably

• Components subscribe to the updated state using mapStateToProps
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Q3. Difference between useMemo and useCallback
Ans. 
useMemo is used to memoize a value, while useCallback is used to memoize a function.
• useMemo is used to memoize a value and recompute it only when its dependencies change.

• useCallback is used to memoize a function and recompute it only when its dependencies change.

• Example: useMemo can be used to memoize the result of a costly computation, while useCallback can be used to memoize a callback function passed to a child comp
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Q4. Difference between slice and splice
Ans. 
Slice is a method that returns a shallow copy of a portion of an array into a new array, while splice is a method that changes the contents of an array by removing or replacing existing elements.
• Slice does not modify the original array, while splice does.

• Slice takes two arguments - start and end index, while splice takes three arguments - start index, number of elements to remove, and optional elements to add.

• Example: ...read more
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Q5. What is event loop?
Ans. 
Event loop is a mechanism in JavaScript that allows for asynchronous operations to be executed in a non-blocking way.
• Event loop is responsible for handling asynchronous operations in JavaScript.

• It allows for non-blocking execution of code by continuously checking the call stack and the callback queue.

• Event loop processes tasks in a queue and executes them one by one.

• Example: setTimeout() function in JavaScript uses eve...read more
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Q6. Is Node js multi threaded?
Ans. 
No, Node.js is single-threaded.
• Node.js uses an event-driven, non-blocking I/O model which makes it single-threaded.

• It utilizes the event loop to handle multiple requests efficiently.

• However, Node.js can still leverage multi-core systems by spawning child processes.
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Q7. Can write code for authentication using JWT
Ans. 
Yes, I can write code for authentication using JWT.
• Generate a JWT token upon successful login

• Verify the JWT token on subsequent requests

• Set expiration time for JWT tokens to enhance security
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Q1. What is Retrieval augmentation generation?
Ans. 
Retrieval augmentation generation is a technique used in natural language processing to improve the quality of generated responses by combining retrieval-based and generation-based methods.
• Retrieval augmentation generation involves retrieving relevant information from a knowledge base or corpus and then using this information to generate a response.

• It combines the benefits of retrieval-based methods (which provide accu...read more
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Q2. Write a code to remove duplicate from list without using set
Ans. 
Code to remove duplicates from list without using set
• Iterate through the list and compare each element with the rest of the elements

• If a duplicate is found, remove it from the list
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50 MCQ type interview questions on selenium, manual and appium.