Jagdamba Auto Components Senior Engineer Interview Questions and Answers

Hacker Rank test with medium difficulty

Q1. Technical discussion mainly around system design, different architectures, problem solving and coding question may be asked.
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A case study for a problem statement

Q1. Asked to write a program to check whether string is valid or not. String consists of only three kind of special characters "(), [], {}". We need to return true if all special characters are in correct for...read more
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Q2. What is useRef hook used for?
Ans. 
useRef hook is used to persist a mutable value across renders without causing a re-render.
• Used to store mutable values that do not trigger re-renders.

• Commonly used for accessing DOM elements or storing previous values.

• Does not cause a re-render when the value changes.
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Q3. What are the best practices to avoid rerenders and to improve performance
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Use memoization, virtual DOM, and shouldComponentUpdate to avoid unnecessary rerenders and improve performance.
• Implement memoization to store the result of expensive function calls and avoid recalculating them.

• Use virtual DOM to efficiently update only the parts of the UI that have changed.

• Override shouldComponentUpdate to prevent unnecessary rerenders by comparing current and next props/state.
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Q4. What are callbacks, Promises, async await
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Callbacks, Promises, async await are asynchronous programming concepts in JavaScript.
• Callbacks are functions passed as arguments to another function to be executed later.

• Promises are objects representing the eventual completion or failure of an asynchronous operation.

• async await is a syntax for writing asynchronous code that looks synchronous, making it easier to read and maintain.

• Example: Using a callback to handle th...read more
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Write word count program

Q1. Architecture of Spark
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Q2. What is AWS Glue job
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Array questions - rearranging letters for encryption

Q1. Introduce yourself and your experience in college.
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Q2. Database and sql related questions
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Q1. Do you have working experience of SwiftUI
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Q2. Have you ever implemented or worked with server driven UIs
Ans. 
Yes, I have experience implementing server driven UIs.
• Implemented server driven UIs using JSON responses to dynamically update UI elements

• Worked with frameworks like React and Angular to handle server driven UI updates

• Used server driven UIs to efficiently manage and display large amounts of data
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Q1. What is closure and types?
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Closure is a function that captures variables from its surrounding scope, allowing it to access those variables even after the scope has closed.
• Closure allows a function to access variables from its lexical scope even after the function has finished executing.

• Types of closures include lexical closures, which capture variables from the surrounding lexical scope, and function closures, which capture variables from the fu...read more
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Q2. What is Core data and all operations with example/scenarios
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Core Data is a framework provided by Apple for managing the model layer objects in an iOS application.
• Core Data is used for storing, retrieving, and managing data in an iOS app.

• It provides an object-oriented interface to work with data.

• Operations include creating, reading, updating, and deleting data.

• Example: Creating a new record in Core Data for a user profile.

• Example: Fetching a list of items from Core Data to displ
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Q1. Why you want to join the company?
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Q2. Why should we hire you
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Initially, they shortlist the candidates and group them into batches of 15 students. During this process, they conduct a group discussion (GD) in which each student has 3 minutes to think, followed by an opportunity to describe their points in 2 to 3 minutes.

Q1. Reverse a linked list
Ans. 
Reverse a linked list by changing the next pointers of each node
• Initialize three pointers: prev = null, current = head, next = null

• Iterate through the linked list, updating next to current's next, current's next to prev, and moving prev and current pointers forward

• Return the new head, which is the last node visited
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Q2. Find a bit is set
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To find if a bit is set, use bitwise AND operator with the bit position
• Use bitwise AND operator (&) with the bit position to check if it is set

• If the result is greater than 0, then the bit is set

• Example: Check if 3rd bit is set in binary number 1010 - (1010 & 0100) = 0100 (4), so 3rd bit is set
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Q3. Create a thread in process
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Creating a thread in a process involves allocating resources for a new thread to run concurrently with other threads.
• Use threading libraries like pthreads in C or java.util.concurrent in Java

• Create a new thread object and pass a function or method to be executed by the thread

• Start the thread to begin execution

• Join the thread to wait for it to finish before continuing
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Basic aptitude questions

Linked list, array, tree and graph questions