Q1. What is prop drilling
Ans. 
Prop drilling is the process of passing props down multiple levels of nested components in React.
• Prop drilling occurs when a prop needs to be passed through multiple levels of components that do not need the prop themselves.

• It can lead to unnecessary passing of props through intermediate components, making the code harder to maintain.

• To avoid prop drilling, you can use Context API, Redux, or React's useContext and useR...read more
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Q2. What is hoisting
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 to the top of their scope, but not their assignments.

• Function declarations are fully hoisted, meaning they can be called before they are declared.

• Hoisting can lead to unexpected behavior if not understood properly.
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Q1. Explain useContext hook
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useContext hook allows components to access data from a context without passing props down manually
• useContext hook is used to consume a context created by React.createContext

• It takes the context object as an argument and returns the current context value for that context

• It allows components to subscribe to context changes and re-render when the context value changes
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Q1. All javascript core concepts and react hooks
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Find the max values, promises, async await

Online coding round which included question from React and js

Q1. Common questions from js
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Q2. Coding to do in react
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Q1. Managerial questions
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Q2. Questions based on resume
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Q1. Salary discussion
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Q1. Tell be about yourself
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Q2. Skills questions
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Q1. Online Quiz in My Skills
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Q1. Tell me about your self
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What is react , feature, axios, API

Redux Redux toolkit Redux thunk

Q1. What is Redux ? How we are using it in real time
Ans. 
Redux is a predictable state container for JavaScript apps.
• Redux is a state management library for JavaScript applications.

• It helps in managing the state of the application in a predictable way.

• Redux stores the entire state of the application in a single immutable object.

• Actions are dispatched to update the state, and reducers specify how the state changes in response to actions.

• Redux is commonly used with React to man...read more
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Q2. What is Virtual Dom ? and its work in reactjs
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Virtual DOM is a lightweight copy of the actual DOM in memory, used by React to improve performance by minimizing actual DOM manipulations.
• Virtual DOM is a concept where a lightweight copy of the actual DOM is kept in memory.

• React uses Virtual DOM to improve performance by minimizing actual DOM manipulations.

• When state changes in a React component, a new Virtual DOM representation is created and compared with the previ...read more
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Q3. What is difference in usememo and react.memo
Ans. 
useMemo is used for memoizing expensive calculations, while React.memo is used for memoizing functional components.
• useMemo is a hook used to memoize expensive calculations and only recompute the value when the dependencies change.

• React.memo is a higher order component used to memoize functional components and prevent unnecessary re-renders.

• useMemo is typically used for optimizing performance by caching values, while Re...read more
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Q4. Difference between map and forEach ?
Ans. 
map returns a new array with modified elements, forEach does not return anything and just iterates over the array.
• map returns a new array with the results of calling a provided function on every element in the array.

• forEach executes a provided function once for each array element without returning anything.

• Example: const numbers = [1, 2, 3]; const doubled = numbers.map(num => num * 2); // doubled will be [2, 4, 6]; num...read more
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Q5. Find Duplicacy Array
Ans. 
Find duplicates in an array of strings
• Iterate through the array and use a hash map to keep track of the frequency of each element

• If an element is already in the hash map, it is a duplicate
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Q6. What is Currying function ?
Ans. 
Currying is a technique in functional programming where a function with multiple arguments is transformed into a sequence of functions, each taking a single argument.
• Currying helps in creating reusable functions and improving code readability.

• It allows partial application of functions, where some arguments are fixed and others are left to be provided later.

• Example: const add = (a) => (b) => a + b; add(2)(3) will return
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Q1. Difference between Actual Dom and Virtual Dom?
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Actual DOM represents the real structure of the web page, while Virtual DOM is a lightweight copy used for efficient updates.
• Actual DOM is the real structure of the web page that is directly manipulated by the browser.

• Virtual DOM is a lightweight copy of the Actual DOM that React uses for efficient updates.

• Changes made to the Virtual DOM are compared with the Actual DOM, and only the differences are updated in the Actu...read more
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Q2. Answer for: console.log(typeof typeof 1)
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