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JavaScript & React Basic Interview Questions – Q&As

Below is a mix of JavaScript and React basic questions covering fundamentals, concepts, and commonly asked topics in frontend interviews 🚀.

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🟢 JavaScript Basics

1. What is JavaScript, and how does it work in the browser?

Answer:

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Frontend Performance Optimization – Interview Q&As

Frontend performance optimization is crucial for faster load times, better user experience, and SEO ranking. Below are the most commonly asked interview questions and answers covering best practices, Core Web Vitals, rendering optimizations, and real-world scenarios 🚀.

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🟢 Core Performance Concepts

1. What are the key factors that impact frontend performance?

Answer:

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Frontend Security Best Practices – Interview Q&As

Frontend security is crucial to prevent data breaches, attacks, and unauthorized access. Below are the most commonly asked questions and answers covering XSS, CSRF, authentication, CORS, and other security measures 🚀.

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🟢 Core Frontend Security Concepts

1. What are the most common security vulnerabilities in frontend applications?

Answer:

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Frontend DevOps (CI/CD, Deployment, Monitoring) – Interview Q&As

Frontend DevOps focuses on automating deployment, optimizing performance, and monitoring web applications. Below are the most common interview questions and answers covering CI/CD pipelines, deployment strategies, and monitoring tools 🚀.

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🟢 CI/CD (Continuous Integration & Continuous Deployment)

1. What is CI/CD, and why is it important for frontend development?

Answer:

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System Design for Frontend Engineers – Interview Q&As

System design interviews for frontend engineers focus on scalability, performance, architecture, state management, and best practices in modern web applications. Below are the most commonly asked questions and answers covering core concepts, real-world scenarios, and best practices. 🚀

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🟢 Core System Design Concepts

1. What is System Design in Frontend Development?

Answer:

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Frontend Architecture interview questions and answers, covering core concepts, best practices, and real-world scenarios commonly asked in technical interviews for junior to mid-level frontend engineers. 🚀

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🟢 Core Frontend Architecture Concepts

1. What is Frontend Architecture? Why is it important?

Answer:
Frontend architecture is the design, structure, and organization of frontend codebases to ensure scalability, maintainability, and performance.

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Great choice! Below are JavaScript interview questions and answers, divided into Basic, Intermediate, and Advanced levels.

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🟢 Basic JavaScript Questions

1. What is JavaScript, and how is it different from Java?

Answer:
JavaScript is a lightweight, interpreted programming language used for web development.

• Java is a compiled, object-oriented language used for backend and applications.

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🟢 Basic ES6+ Features

1. What are the key features introduced in ES6?

Answer:
ES6 introduced several improvements, including:

• let & const (Block-scoped variables)
• Arrow functions (() => {})
• Template literals (Hello ${name})
• Destructuring
• Default parameters

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JavaScript interview questions and answers, divided into Basic, Intermediate, and Advanced levels Part 1.

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🟢 Basic JavaScript Questions

1. What is JavaScript, and how is it different from Java?

Answer:
JavaScript is a lightweight, interpreted programming language used for web development.

• Java is a compiled, object-oriented language used for backend and applications.

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Basic CSS Questions

1. What is CSS, and why is it used?

Answer:
CSS (Cascading Style Sheets) is a stylesheet language used to control the appearance and layout of web pages.
It is used to:

• Style elements (color, font, background, etc.).
• Control layout (positioning, flexbox, grid, etc.).
• Ensure responsiveness across different devices.
• Enhance accessibility and user experience.