TraviYo Dot Net Core Developer Interview Questions and Answers

Round duration - 90 minutes
Round difficulty - Easy

Timing was 10:00 AM. Platform was good.

Q1. 
Subarray With Given Sum Problem Statement
Given an array ARR of N integers and an integer S, determine if there exists a contiguous subarray within the array with a sum equal to S. If such a subarray exis...read more
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Q2. 
Remove Consecutive Duplicates Problem Statement
Given a string S, your task is to recursively remove all consecutive duplicate characters from the string.
Input:
String S
Output:
Output string
Constr...read more
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There was an OA on hackerearth of an hour. In that there were 20 MCQs and two DSA questions easy to medium on Heap, Hashmap and Subarray

Q1. Asked about previous worked project in last company
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Q2. Asked one medium DSA question (DNA sequencing) and asked to design some schema
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Q3. Asked one puzzle If there are 1000 bottles and one is poisonous, a rat will diw after one hour of drinking and you have only one hour to find out which bottle is poisonous, How many minimum rats you need ?
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Q1. Convert Roman to integer
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Q2. SQL queries optimisation & SQL engine
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Q1. What is the difference between a process and a Thread?
Ans. 
Processes are independent execution units with their own memory, while threads are lightweight and share memory within a process.
• A process is an independent program in execution, while a thread is a smaller unit of a process.

• Processes have their own memory space; threads share the same memory space of their parent process.

• Creating a process is more resource-intensive than creating a thread.

• Example: A web browser (proce...read more
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Q2. What does rest stands?
Ans. 
REST stands for Representational State Transfer, a software architectural style for designing networked applications.
• REST is based on stateless communication between client and server.

• It uses standard HTTP methods like GET, POST, PUT, DELETE.

• Resources are identified by URIs (Uniform Resource Identifiers).

• Data is typically exchanged in formats like JSON or XML.

• RESTful APIs are widely used in web services for their simpl...read more
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Q1. Find the second most occurrence of string.
Ans. 
Find the second most occurrence of string in an array of strings.
• Create a dictionary to store the count of each string in the array

• Sort the dictionary by count in descending order

• Return the key of the second element in the sorted dictionary
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Q1. Rate yourself in js, node js, react, MongoDB (separately)
Ans. 
I have a solid understanding of JS, Node.js, React, and MongoDB, with practical experience in building full-stack applications.
• JavaScript: Proficient in ES6+ features, asynchronous programming, and DOM manipulation. Example: Built a dynamic web app using vanilla JS.

• Node.js: Experienced in building RESTful APIs and handling server-side logic. Example: Developed a Node.js API for a task management app.

• React: Skilled in c...read more
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Q2. Typeof null, typeof undefined, typeof {}, typeof NaN
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Q3. What changes came in es6
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Q4. This keyword, closures, hoisting
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Q5. Are let and cont variables hoisted?
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Q6. What is global context
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Q7. What is temporal deadzone
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Q8. What is modules? types of modules in nodejs
Ans. 
Modules in Node.js are reusable blocks of code that encapsulate related functionality.
• Modules in Node.js can be built-in modules like fs (file system) or third-party modules like express.

• Modules help in organizing code into separate files for better maintainability and reusability.

• Modules can be imported using the require() function in Node.js.
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Q9. Index in mongodb, why we need index, is index good or bad?
Ans. 
Indexes in MongoDB improve query performance by allowing the database to quickly locate and retrieve specific documents.
• Indexes help to speed up query performance by allowing the database to quickly locate specific documents based on the indexed fields.

• Without indexes, MongoDB would have to perform a collection scan, which can be slow and resource-intensive.

• Indexes can be created on single fields or compound fields to ...read more
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Q10. What are hooks , use of useRef
Ans. 
Hooks are a feature in React that allow you to use state and other React features in functional components. useRef is a hook that allows you to create a mutable object that persists for the lifetime of the component.
• Hooks are used to add state and lifecycle methods to functional components in React

• useRef is used to create a mutable reference that persists between renders

• useRef can be used to access DOM elements directl...read more
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Q11. Fs module, http module, worker thread?
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Q12. Why we use mongoose not mongodb driver?
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Q1. Leetcode Medium Question -- Container most water
Ans. 
Find two lines that, together with the x-axis, form a container that holds the most water.
• Use two pointers, one at each end of the array.

• Calculate the area formed by the lines at the two pointers.

• Move the pointer pointing to the shorter line inward to potentially find a taller line.

• Repeat until the two pointers meet, keeping track of the maximum area found.

• Example: For heights [1,8,6,2,5,4,8,3,7], the maximum area is 4...read more
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Q1. LLD, Design patterns, Operating system
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