rtCamp Solutions Web Engineer Interview Questions and Answers

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
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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
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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
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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. Difference between function and method
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Q2. A program related to strings
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Q3. A program related to prime numbers
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Q1. How do you stay updated with current design trends?
Ans. 
I stay updated with current design trends by regularly reading design blogs, attending conferences, and following industry leaders on social media.
• Regularly reading design blogs

• Attending design conferences

• Following industry leaders on social media
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Q2. What design tools and software are you proficient in?
Ans. 
Proficient in Adobe Creative Suite, Sketch, Figma, and InVision.
• Adobe Creative Suite

• Sketch

• Figma

• InVision
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Q3. What's your process for optimizing a website for performance and speed ?
Ans. 
My process involves optimizing images, minifying code, leveraging browser caching, and reducing server response time.
• Optimize images by compressing and resizing them

• Minify CSS, JavaScript, and HTML files to reduce file sizes

• Leverage browser caching to store static resources locally

• Reduce server response time by optimizing server configurations
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Q1. "What are the key differences between continuous integration, continuous delivery, and continuous deployment in a Devops pipeline?
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Q2. Research the company culture before applying
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Q1. What is single page application
Ans. 
Single page application is a web application that loads a single HTML page and dynamically updates the content as the user interacts with the app.
• SPA uses AJAX and HTML5 to create fluid and responsive user experience.

• It eliminates the need for page reloading during use, making it faster and more efficient.

• Examples include Gmail, Facebook, and Google Maps.
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Q2. What is state management
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State management is the process of managing the state of an application, including data flow, user interface updates, and user interactions.
• State management involves storing and updating the state of an application to ensure data consistency.

• It helps in managing user interface updates based on changes in the application state.

• State management is crucial for handling user interactions and maintaining a seamless user exp...read more
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Q1. Basic flutter coding questions
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Q1. What is jdk, string related questions, basic java oops questions?
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It was of 75 minutes. And Questions are related from Quantitative, logical reasoning and Coding.

DSA Questions were asked there