Frontend Interview Handbook by @abhi_techhub

Frontend Interview Handbook - Revision Guide

This handbook, created by @abhi_techhub, is a comprehensive 12-page revision guide for frontend developer interviews, covering fundamentals to advanced concepts.

Key Interview Topics Covered:

• Browser Functionality:
  • What happens after a URL is entered.
  • Reflow vs. Repaint.
  • async vs. defer attributes for script loading.
  • JavaScript Event Loop.
  • Microtask vs. Macrotask.
• React Concepts:
  • useMemo vs. useCallback.
  • React Components, Props, and State.
  • Virtual DOM and Reconciliation.
  • React Hooks.
  • React.memo().
  • Lazy Loading and Code Splitting.
  • Context API and Custom Hooks.
  • Error Boundaries and Portals.
• Security:
  • Preventing XSS (Cross-Site Scripting) & CSRF (Cross-Site Request Forgery).
  • JWT & OAuth Basics.
  • Content Security Policy.
• Performance Optimization:
  • Debounce vs. Throttle.
  • Optimizing a slow frontend.
  • Core Web Vitals.
  • Bundle Optimization.
  • Frontend Performance Best Practices.

Detailed Content Breakdown:

• Browser Internals:
  • How Browsers Work
  • DOM, CSSOM & Render Tree
  • Critical Rendering Path (CRP)
  • Reflow vs. Repaint
• HTML & Accessibility:
  • Semantic HTML
  • Accessibility
• Script Loading:
  • async vs. defer
• CSS:
  • CSS Box Model & Specificity
  • Flexbox vs. Grid
  • Responsive Design & Media Queries
• JavaScript Fundamentals:
  • var vs. let vs. const
  • Scope, Hoisting & Closures
  • Execution Context & Call Stack
  • Promises & async/await
  • JavaScript Event Loop
  • Microtask vs. Macrotask
  • this Keyword & Prototypes
• React Specifics:
  • React Components, Props & State
  • Virtual DOM & Reconciliation
  • React Hooks
  • React.memo()
  • useMemo() vs. useCallback()
  • Lazy Loading & Code Splitting
  • Context API & Custom Hooks
  • Error Boundaries & Portals
• Storage:
  • Cookies vs. LocalStorage vs. SessionStorage
• Networking & Protocols:
  • HTTP/HTTPS, DNS & TLS
  • Browser Caching & CDN
  • CORS (Cross-Origin Resource Sharing)
• Security:
  • XSS & CSRF
  • JWT & OAuth Basics
  • Content Security Policy
• Performance & Optimization:
  • Debounce vs. Throttle
  • Core Web Vitals
  • Bundle Optimization
  • Frontend Performance Best Practices

Call to Action:

• Save this 12-page handbook for future reference.
• Share it with other frontend developers preparing for interviews.
• Comment "FRONTEND" to request more similar handbooks.

Follow @abhi_techhub for more content on Frontend, React, JavaScript, System Design, LLD, DSA & Software Engineering.