IMPACT Infotech Interview Questions and Answers

Q1. Explin solid principal
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Q1. What is Reconciliation ?
Ans. 
Reconciliation is the process of updating the UI to match the current state of the application.
• Reconciliation is the algorithm used by React to update the DOM efficiently.

• It compares the virtual DOM with the actual DOM and only updates the parts that have changed.

• Reconciliation is a key feature of React that helps in optimizing performance.

• Examples include adding, removing, or updating elements in a list without re-ren...read more
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Q2. UseMemo vs react.memo
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useMemo is a hook used for memoization of expensive calculations, while react.memo is a higher order component used for memoizing functional components.
• useMemo is used to memoize expensive calculations and can be used inside functional components.

• react.memo is used to memoize functional components to prevent unnecessary re-renders.

• useMemo returns a memoized value, while react.memo returns a memoized component.

• Example: ...read more
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2 Easy Leetcode questions and 1 Medium in 1.5 hours

Q1. Linear Regression
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Q2. Best time series models for non stationary data
Ans. 
Some of the best time series models for non-stationary data include ARIMA, SARIMA, and LSTM.
• ARIMA (AutoRegressive Integrated Moving Average) model is commonly used for non-stationary time series data.

• SARIMA (Seasonal ARIMA) model is an extension of ARIMA that can handle seasonal patterns in the data.

• LSTM (Long Short-Term Memory) neural network model is effective for capturing long-term dependencies in time series data.
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Q1. Tell me about your CV
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Q2. Questions on some scenerios and how i adjust
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Coding test
Ex program and math

Q1. Technical interview About Web dev technology
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Q2. Oops Web development concept Node. Js, react.js
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Q3. Oops question ex encapsulation etc
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Q4. What is props and state
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Props are read-only data passed from parent to child components, while state is mutable data managed within a component.
• Props are used to pass data from parent to child components

• Props are read-only and cannot be modified by the child component

• State is mutable data managed within a component

• State can be updated using setState() method

• Example: props are used to pass a user's name to a child component, while state is use...read more
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Q5. What is virtual dom
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Virtual DOM is a lightweight copy of the actual DOM that React uses to improve performance by minimizing direct manipulation of the actual DOM.
• Virtual DOM is a concept in React where a lightweight copy of the actual DOM is created and updated instead of directly manipulating the actual DOM.

• When changes are made to the virtual DOM, React compares it with the actual DOM and only updates the necessary parts, reducing the ...read more
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