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10+ ROITech Consulting Pvt Ltd. Interview Questions and Answers

Updated 29 Nov 2024

Q1. 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 further optimize query performance.

  • However, indexes come w...read more

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Q2. What is the use of JAVA API?

Ans.

The JAVA API is a collection of pre-written classes and interfaces that provide ready-to-use functionality for Java developers.

  • The JAVA API allows developers to save time and effort by using pre-built code for common tasks.

  • It provides a wide range of classes and interfaces for various purposes such as file handling, networking, database connectivity, GUI development, etc.

  • Developers can leverage the API to access system resources, interact with external services, and perform c...read more

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Q3. 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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Q4. Inheritance and Concept of Abstract Classes and Interfaces

Ans.

Inheritance allows a class to inherit properties and behaviors from another class. Abstract classes cannot be instantiated and can have abstract methods. Interfaces define a contract for classes to implement.

  • Inheritance allows a class to inherit properties and behaviors from another class

  • Abstract classes cannot be instantiated and can have abstract methods

  • Interfaces define a contract for classes to implement

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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. 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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Q7. 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 directly in functional components

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Q8. 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 programming

  • Modules for better code organization

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Q9. 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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Q10. 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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Q11. Throws Vs Throw

Ans.

Throws is used for checked exceptions in Java, while throw is used to explicitly throw an exception.

  • Throws is used in method signature to declare that the method may throw a checked exception.

  • Throw is used to actually throw an exception in the code.

  • Example: public void method() throws IOException { //code }

  • Example: throw new IOException();

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Q12. write a program to find sum and average of the digits that appear in the string, ignoring all other characters. string="PYnative29@#8496"

Ans.

Program to find sum and average of digits in a string, ignoring other characters.

  • Iterate through each character in the string and check if it is a digit.

  • If it is a digit, convert it to an integer and add it to the sum.

  • Keep track of the count of digits to calculate the average at the end.

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Q13. which cable is used to transfer the data

Ans.

Ethernet cable is commonly used to transfer data in networking applications.

  • Ethernet cable is commonly used for wired internet connections

  • USB cable is used for transferring data between devices like computers and smartphones

  • HDMI cable is used for transferring audio and video data between devices like TVs and laptops

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Q14. Find the second most occurrence if string in JavaScript

Ans.

Find the second most occurrence of a string in an array of strings in JavaScript.

  • Create a map to store the count of each string in the array

  • Sort the map by values in descending order to find the most occurrence

  • Return the key of the second element in the sorted map

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Q15. Create a todo app with react and basic form validation

Ans.

Create a todo app with react and basic form validation

  • Use React to create components for adding, displaying, and deleting todos

  • Implement basic form validation using state and event handlers

  • Utilize CSS for styling the app and make it user-friendly

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Q16. architecture of application previously worked on

Ans.

Used a microservices architecture with React as the front-end framework.

  • Implemented separate services for different functionalities like user authentication, data retrieval, and payment processing.

  • Used RESTful APIs to communicate between services.

  • Utilized Redux for state management and to maintain a single source of truth for the application.

  • Deployed the application on AWS using Docker containers for scalability and flexibility.

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Q17. 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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Q18. What is Embedded development

Ans.

Embedded development is the process of creating software that is embedded into hardware devices to control their functions.

  • Involves programming microcontrollers or microprocessors

  • Requires knowledge of hardware and software interactions

  • Common in devices like smartphones, IoT devices, and automotive systems

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Q19. Second most occuring character in the string

Ans.

Find the second most occurring character in a string.

  • Create a frequency map of characters in the string

  • Sort the characters based on their frequency

  • Return the second most frequent character

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