Prathigna.com HR Solutions Interview Questions and Answers for Freshers

There will be 3 coding questions. They are of medium and hard level.

Q1. Sort array consisting 0's 1's and 2's without inbuilt functions
Ans. 
Sort an array of 0's, 1's, and 2's without using inbuilt functions.
• Use three pointers to keep track of the last index of 0's, 1's, and 2's

• Iterate through the array and swap elements based on their value

• Continue until all elements are sorted
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Q1. Os cn related questions
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Q1. Java questions and general hr questions
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All coding questions were ad hoc

Q1. Leetcode questions were asked
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Q2. A question about cache memory was asked
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I had to evaluate a software and let them understand where this software could be implemented and the pros and cons of the software.

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)
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Q2. Typeof null, typeof undefined, typeof {}, typeof NaN
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Q3. What changes came in es6
Ans. 
ES6 introduced several new features and improvements to JavaScript, making it more powerful and efficient.
• Arrow functions for more concise syntax

• Let and const for block-scoped variables

• Classes for easier object-oriented programming

• Template literals for easier string interpolation

• Default parameters and rest parameters for function arguments

• Destructuring assignment for easier data extraction

• Promises for asynchronous prog
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Q4. This keyword, closures, hoisting
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Q5. Are let and cont variables hoisted?
Ans. 
Yes, let and const variables are hoisted but not initialized.
• let and const variables are hoisted to the top of their block scope, but they are not initialized until the actual line of code is executed.

• This means that you cannot access a let or const variable before it is declared in the code.

• For example, trying to access a let variable before it is declared will result in a ReferenceError.
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Q6. What is global context
Ans. 
Global context refers to the overall environment or setting in which something exists or operates.
• Global context encompasses all variables, functions, and objects that are accessible throughout an entire program.

• It can be thought of as the 'big picture' view of a program's execution.

• In web development, global context includes the window object in JavaScript.
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Q7. What is temporal deadzone
Ans. 
Temporal dead zone is a period during the variable creation process where accessing the variable results in a ReferenceError.
• Occurs when trying to access a variable before it has been declared with let or const

• Happens due to the variable being in the temporal dead zone until it is declared

• Example: accessing a variable before its declaration will result in a ReferenceError
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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
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Q11. Fs module, http module, worker thread?
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Q12. Why we use mongoose not mongodb driver?
Ans. 
Mongoose is an Object Data Modeling (ODM) library for MongoDB that provides a higher level of abstraction and simplifies interactions with the database.
• Mongoose provides schema validation which helps maintain data integrity.

• Mongoose simplifies querying and data manipulation with built-in functions.

• Mongoose supports middleware functions for pre and post processing of data operations.
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Q1. Leetcode Medium Question -- Container most water
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Q1. LLD, Design patterns, Operating system
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Q1. Tell me about yourself
Ans. 
I am a dedicated and experienced professional with a strong background in project management and team leadership.
• Over 8 years of experience in project management

• Successfully led cross-functional teams to deliver projects on time and within budget

• Strong communication and interpersonal skills

• Proven track record of driving results and exceeding goals
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Q2. Why should we hire you
Ans. 
I have a proven track record of delivering exceptional results and possess the skills and experience necessary to excel in this role.
• Proven track record of exceeding performance targets

• Strong communication and leadership skills

• Extensive experience in the industry

• Ability to work effectively in a team environment

• Passion for continuous learning and professional development
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Q3. Why should we buy your product
Ans. 
Our product offers innovative solutions to streamline processes, increase efficiency, and drive growth.
• Our product has been proven to save companies time and money by automating repetitive tasks.

• We provide excellent customer support and training to ensure successful implementation.

• Our product is constantly updated with new features and improvements based on customer feedback.

• Competitive pricing compared to similar prod...read more
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Q1. Interviewer asked me to tell about the ternary operator in Kotlin.
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Q2. How WhatsApp is generating money.
Ans. 
WhatsApp generates money through its business API and WhatsApp Business app.
• WhatsApp Business API charges businesses for sending messages to customers.

• WhatsApp Business app offers tools for small businesses to communicate with customers more effectively.

• WhatsApp also plans to introduce ads in the Status feature to generate revenue.
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