TraviYo Dot Net Core Developer Interview Questions and Answers

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. One Puzzle to detect Defective Box
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Q2. Previous Work Experience
Ans. 
I have 3 years of experience as a Software Developer at XYZ company.
• Developed web applications using Java and Spring framework

• Collaborated with cross-functional teams to deliver projects on time

• Implemented new features and enhancements based on client requirements
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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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Couple of MCQ, Two Coding Questions. One medium, One hard.

Q1. Convert Roman to integer
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Q2. SQL queries optimisation & SQL engine
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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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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
Ans. 
Given an array of integers, find a subarray with a given sum S.
• Iterate through the array while keeping track of the current sum and start index.

• Use a hashmap to store the sum and its corresponding index.

• If the current sum - S is found in the hashmap, a subarray with sum S exists.

• Return the start index and current index as the end index.
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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
Ans. 
Recursively remove consecutive duplicate characters from a string.
• Use recursion to check if the current character is the same as the next character, if so skip the next character

• Base case: if string length is 1, return the string

• Example: Input: 'aabbc' Output: 'abc'
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