10+ Interview Questions and Answers

Choose database based on project requirements, scalability, performance, and budget.

• Consider the type of data you will be storing (structured, unstructured, semi-structured)

• Evaluate the scalability requirements of your project

• Assess the performance needs of your application

• Take into account the budget constraints for the project

• Consider the level of expertise available for managing the database

• Examples: MySQL for small-scale projects, MongoDB for unstructured data, PostgreSQL...read more

CSS specificity determines which style rule is applied to an element when multiple rules have conflicting selectors.

• Specificity is calculated based on the type of selector used in a CSS rule.

• Inline styles have the highest specificity, followed by IDs, classes, and elements.

• Using !important in a rule increases its specificity, but should be used sparingly.

• Specificity is important to understand when troubleshooting CSS styling issues.

Normal functions are defined using the function keyword, while arrow functions are defined using the => syntax.

• Normal functions are hoisted, while arrow functions are not.

• Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.

• Arrow functions are more concise and have implicit return.

• Arrow functions cannot be used as constructors.

• Example: const normalFunction = function() {}; const arrowFunction = () => {};

Closure in JavaScript is the combination of a function and the lexical environment within which that function was declared.

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

• It is created whenever a function is defined within another function, and the inner function has access to the outer function's variables.

• Example: function outerFunction() { let outerVar = 'I am outer'; function innerFunction() { console...read more

React state management is a way to manage and update the state of components in a React application.

• State management helps in storing and updating data within components.

• React provides built-in state management using the useState hook.

• For more complex state management, libraries like Redux or Context API can be used.

• State management helps in keeping the UI in sync with the data changes.

Docker is a platform for developing, shipping, and running applications in containers.

• Docker allows developers to package applications and their dependencies into containers.

• Containers are lightweight, portable, and isolated environments that can run on any system.

• Docker simplifies the process of building, deploying, and scaling applications.

• Example: Running a web server in a Docker container.

Callback is a function that is passed as an argument to another function and is executed after the completion of that function.

• Callback functions are commonly used in asynchronous programming to handle tasks that take time to complete.

• Examples include event listeners in web development, setTimeout function in JavaScript, and AJAX requests.

• Callbacks can be synchronous or asynchronous depending on the programming language and context.

Closures are functions that have access to variables from their containing scope even after the function has finished executing.

• Closures allow functions to 'remember' variables from their outer scope

• They are commonly used in event handlers and callbacks

• Closures help in creating private variables in JavaScript

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 has access to the outer function's variables.

• The inner function can access and modify the outer function's variables even after the outer function has returned.

• Closure is commonly used to create private variables and functions in JavaScript.

• Example: function outerFunction...read more

Node Version Manager (NVM) allows managing multiple Node.js versions on the same machine.

• NVM allows you to easily switch between different Node.js versions on your machine.

• It helps in handling higher Node.js versions in a lower Node.js version environment.

• You can install, uninstall, and switch between Node.js versions using NVM.

• Example: 'nvm install 12.18.3' to install a specific Node.js version.

Garbage collector in Java is responsible for automatically managing memory by reclaiming unused objects.

• Garbage collector runs in the background to reclaim memory from objects that are no longer in use.

• It helps prevent memory leaks and optimize memory usage.

• Examples of garbage collectors in Java include Serial, Parallel, CMS, G1, and Z Garbage Collector.

In JavaScript, == is used for loose equality comparison, while === is used for strict equality comparison.

• == checks for equality after type coercion, while === checks for equality without type coercion

• === is more strict and recommended for use to avoid unexpected behavior

• Example: 1 == '1' will return true, but 1 === '1' will return false

True. == compares only values, while === compares both values and data types.

• == is used for value comparison, while === is used for both value and data type comparison

• Example: 5 == '5' will return true, but 5 === '5' will return false

• Example: 5 === 5 will return true, as both value and data type are the same

PHP frameworks are tools that provide a structured way to build web applications using PHP.

• Choose a PHP framework based on your project requirements and familiarity with the framework.

• Follow the framework's documentation to understand its features and best practices.

• Utilize the framework's built-in functions and libraries to streamline development.

• Leverage the MVC (Model-View-Controller) architecture of the framework to separate concerns and improve code organization.

• Examples...read more

CSS is used to style and format web pages, making them visually appealing and user-friendly.

• CSS is used to control the layout, colors, fonts, and overall appearance of a website.

• It allows for consistent styling across multiple pages of a website.

• CSS can be used to create responsive designs that adapt to different screen sizes.

• It helps improve the user experience by making the website visually appealing and easy to navigate.

• CSS can also be used to create animations and transit...read more

NVM stands for Node Version Manager, a tool used to manage multiple versions of Node.js on a single machine.

• NVM allows developers to easily switch between different versions of Node.js for different projects.

• It helps in avoiding conflicts between different projects that require different versions of Node.js.

• NVM is commonly used in development environments where different projects have different Node.js version requirements.

JavaScript is a programming language commonly used for creating interactive websites.

• JavaScript is a high-level, interpreted programming language.

• It is used to make web pages interactive and dynamic.

• JavaScript can be used for client-side and server-side development.

• Examples: Adding interactivity to buttons, form validation, creating animations.