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10+ Geekyants Software Interview Questions and Answers

Updated 9 Jan 2025

Q1. What are the design patterns that you know and why do we use those?

Ans.

Design patterns are reusable solutions to common software problems.

  • Creational patterns: Singleton, Factory, Abstract Factory, Builder

  • Structural patterns: Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy

  • Behavioral patterns: Chain of Responsibility, Command, Interpreter, Iterator, Mediator, Memento, Observer, State, Strategy, Template Method, Visitor

  • We use design patterns to improve code readability, maintainability, and scalability.

  • They provide a common language...read more

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Q2. What is currying in javascript?

Ans.

Currying is a technique in functional programming where a function with multiple arguments is transformed into a sequence of nested functions, each taking a single argument.

  • Currying helps in creating reusable functions and partial application.

  • In JavaScript, currying can be achieved using closures and nested functions.

  • Example: const add = (a) => (b) => a + b; const add5 = add(5); console.log(add5(3)); // Output: 8

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Q3. Explain promises in JS and async/await.

Ans.

Promises in JS are objects representing the eventual completion or failure of an asynchronous operation. Async/await is a syntactic sugar for working with promises.

  • Promises are used to handle asynchronous operations in JavaScript.

  • They can be in one of three states: pending, fulfilled, or rejected.

  • Async/await is a modern way to work with asynchronous code in JavaScript, making it easier to read and write.

  • Async functions return a promise, allowing you to use the await keyword t...read more

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Q4. what is currying in js

Ans.

Currying is a technique in functional programming where a function with multiple arguments is transformed into a sequence of nested functions, each taking a single argument.

  • Currying helps in creating reusable functions and partial application.

  • In JavaScript, currying can be achieved using closures and nested functions.

  • Example: const add = (a) => (b) => a + b; const add5 = add(5); console.log(add5(3)); // Output: 8

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Discover Geekyants Software interview dos and don'ts from real experiences

Q5. Diff btw vite and webpack

Ans.

Vite is a build tool that focuses on fast development, while Webpack is a more versatile and powerful build tool.

  • Vite is designed for fast development with instant server start and hot module replacement.

  • Webpack is a more versatile tool that can handle complex configurations and optimizations.

  • Vite uses ES modules natively for faster bundling, while Webpack requires additional plugins for the same functionality.

  • Vite is best suited for small to medium-sized projects, while Webp...read more

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Q6. Diff btw webpack and vite

Ans.

Webpack is a mature and feature-rich bundler, while Vite is a newer and faster build tool focused on development experience.

  • Webpack is a mature and feature-rich bundler that is highly configurable and widely used in the industry.

  • Vite is a newer build tool that focuses on providing a faster development experience by leveraging ES modules and server-side rendering.

  • Webpack requires a configuration file (webpack.config.js) to set up the build process, while Vite has zero-config s...read more

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Q7. Closure in Javascript

Ans.

Closure in JavaScript allows a function to access variables from its outer scope even after the outer function has finished executing.

  • Closure is created when a function is defined within another function and the inner function references variables from the outer function.

  • The inner function maintains a reference to the outer function's scope, allowing it to access those variables even after the outer function has returned.

  • Closures are commonly used in event handlers, callbacks...read more

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Q8. Explain the order of specifity in CSS classes, elements, ids, etc

Ans.

Explanation of CSS specificity hierarchy

  • Inline styles have the highest specificity

  • IDs have higher specificity than classes and elements

  • Multiple selectors with the same specificity are resolved by the order in which they appear in the stylesheet

  • The universal selector (*) has the lowest specificity

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Q9. Clone a Todo Application UI using ReactJS, Sass

Ans.

Clone a Todo Application UI using ReactJS, Sass

  • Create a new ReactJS project using create-react-app

  • Design the UI using Sass and implement it in ReactJS

  • Use state and props to manage the todo list

  • Add functionality to add, delete and mark tasks as complete

  • Implement local storage to persist data

  • Test the application thoroughly

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Q10. How does Server-Side Rendering work?

Ans.

Server-Side Rendering (SSR) is the process of rendering web pages on the server and sending the HTML to the client.

  • SSR improves website performance and SEO by reducing load times and providing search engines with fully rendered pages.

  • React provides a library called ReactDOMServer that allows developers to render React components on the server.

  • SSR requires a server-side framework or library, such as Next.js or Gatsby, to handle the rendering and routing of pages.

  • SSR can be com...read more

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