Energy Exemplar Interview Questions, Process, and Tips

Q1. Create basic react app with dummy data fetched from JSON API
Ans. 
Create a basic React app with dummy data fetched from a JSON API.
• Set up a new React project using create-react-app

• Create a component to fetch data from a JSON API using fetch or axios

• Display the fetched data in the component
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Q2. Array methods and Flatten array
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Q3. Event loop
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Q4. HTML and Javascript basics
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It was a mcq + coding round with computer fundamentals and aptitude + easy-medium level dsa questions.

It was an offline aptitute test with 30 questions for 30 minutes.

Q1. Detect a loop in the linked list
Ans. 
Detect a loop in a linked list by using Floyd's Cycle Detection Algorithm
• Use two pointers, slow and fast, to traverse the linked list

• If there is a loop, the fast pointer will eventually meet the slow pointer

• Initialize slow and fast pointers at the head of the linked list

• Move slow pointer by one step and fast pointer by two steps in each iteration

• If the fast pointer reaches the end of the list or meets the slow pointer,
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Q2. Find the unique element in an array
Ans. 
Find the unique element in an array of strings
• Iterate through the array and use a hashmap to store the frequency of each element

• After iterating, check the hashmap for elements with frequency 1 to find the unique element
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Q3. Tell about your projects
Ans. 
I have worked on various projects including a web application for a local business and a mobile app for tracking daily habits.
• Developed a web application using HTML, CSS, and JavaScript for a local business to manage their inventory and sales.

• Created a mobile app using React Native to track daily habits and provide reminders for healthy routines.

• Collaborated with a team to implement new features and fix bugs in existin...read more
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Q4. Write a MySQL query for selecting the id of second highest salary from employee table
Ans. 
MySQL query to select the id of second highest salary from employee table
• Use ORDER BY clause to sort salaries in descending order

• Use LIMIT to select the second row

• Use a subquery to avoid duplicates if multiple employees have the same salary
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Q1. DSA questions & SQL queries
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Q1. Again dsa round
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Q1. HR + general questions based on internship, projects, etc
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Q1. DSA questions & SQL queries
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Q1. Again dsa round
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Q1. HR + general questions based on internship, projects, etc
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Q1. Concat two LinkedList without using any space and in O(n) time
Ans. 
Concatenate two LinkedList without using extra space in O(n) time
• Traverse the first LinkedList and update the last node's next pointer to the head of the second LinkedList

• Return the head of the first LinkedList as the concatenated LinkedList
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Q2. 2 Sql Queries -1] rank window function 2] join
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Q3. Project focused
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Q1. Discussion about Interfaces
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Q2. Discussion about Dependency Injection in .net
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Q3. Multiple .net questions
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Q1. Create Data structure to store file system like tree. it should get used for file and folder both.? find count of files in folder ?
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Q2. Redis cache system
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Q3. System designing Discussion
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Q4. Dependency Injection discussion
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Q5. Project in depth discussion
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Q1. Project Focused questions
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Q2. What are your contributions in projects
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