Tested my React.js theory a. Stateful vs stateless (answered), b. lifecycle methods (answered), c. use of Hooks in functional components (answered), d. what does useRef do? (Not answered), e. what is virtual DOM? (Not fully answered) f. used Redux? , (answered) g. useContext, useReducer for global state management. (answered) Moving on to coding (in the same interview) 1. Make a counter (divs that you can click and inc, dec and reset) (done) 2. Make six distinct buttons using array.map() to increment the counter. (done) 3. Style those buttons using flexbox. (done) 4. Create nested components. for one of the buttons. (done) 5. maintain a globall counter state without passing props through the component hierarchy. (UseContext, UseReducer) (done) Hoping for the next round of interviews.

First Round: DSA and Algorithms Basic DSA Concepts What is a data structure, and why is it used? Non-Linear Data Structures Explain a non-linear data structure. Sorting Techniques Explain a sorting algorithm. Divide and Conquer Explain the divide and conquer algorithm. Priority Queue Explain priority queues and their use cases. Deque (Double-Ended Queue) What is a deque, and how does it work? Basic SQL Concepts WHERE Clause What is the use of the WHERE clause? WHERE vs. HAVING Clause Explain the difference between WHERE and HAVING clauses. Second Round: System Design After the first round, a HackerRank link is shared for coding with an invite. Payment Aggregation Given different payment types and corresponding amounts (e.g., {credit card: 400, UPI: 200}), write a function to return the total amount for each payment type. Notification System Design Design a scalable notification system.