JavaScript Must-Read Topics for Senior Developer Interviews

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JavaScript Must-Read Topics for Senior Developer Interviews

Core JavaScript

  1. Variables and Scoping (var, let, const) ✅
  2. Hoisting✅
  3. Closures✅
  4. The Event Loop✅
  5. Promises✅ and Async/Await✅
  6. Callbacks✅
  7. Prototype and Prototypal Inheritance✅
  8. this Keyword and Binding✅
  9. Execution Context and Call Stack✅
  10. Error Handling (try-catch, finally, custom errors)✅
  11. ES6+ Features (Destructuring✅, Spread/Rest✅, Arrow Functions✅, etc.)
  12. Type Coercion and Type Checking ✅
  13. == vs === ✅
  14. Object-Oriented Programming in JavaScript (Classes, Constructors)✅
  15. Functional Programming Concepts (Higher-Order Functions✅, Pure Functions✅, Immutability✅)
  16. Module Systems (require, import/export, CommonJS, ESModules)✅
  17. JavaScript Design Patterns (Singleton, Factory, Observer, etc.)
  18. Garbage Collection✅

Advanced Topics

  1. Currying✅
  2. Memoization✅
  3. Throttling and Debouncing✅
  4. Event Bubbling , Event Capturing and Event Delegation✅
  5. Shadow DOM and Web Components
  6. Iterators, Iterables and Generator✅
  7. WeakMap and WeakSet✅
  8. Proxy and Reflect✅
  9. Symbol✅
  10. Custom Events ✅
  11. Monads and Functional Constructs✅
  12. Bitwise Operations✅
  13. BigInt✅
  14. Dynamic Imports and Code Splitting✅
  15. AST (Abstract Syntax Tree) and Code Transformation

Browser-Specific Topics

  1. DOM Manipulation (Vanilla JS)✅
  2. Event Handling✅
  3. Browser APIs (Fetch API, Web Storage, IndexedDB, etc.)✅
  4. Performance Optimization (Lazy Loading, Intersection Observer)✅
  5. Cross-Origin Resource Sharing (CORS)✅
  6. Service Workers and PWA Concepts
  7. Rendering Lifecycle (Repaints, Reflows, and Composition)✅
  8. Security (XSS, CSRF, CSP)✅
  9. Browser Rendering Process✅
  10. Memory Leaks and Performance Profiling (Chrome DevTools)

Frontend Frameworks/Tools

  1. Component-Based Architecture (React✅, Vue, etc.)
  2. State Management Libraries (Redux, MobX, Zustand)✅
  3. Routing Libraries (React Router, Next.js Routing)✅
  4. CSS-in-JS Libraries (Styled Components, Emotion)
  5. Testing Libraries (Jest, React Testing Library, Cypress)
  6. Webpack, Vite, and Rollup Basics
  7. Server-Side Rendering (SSR) and Static Site Generation (SSG)✅
  8. GraphQL Basics (Queries, Mutations, Apollo)
  9. Form Handling and Validation (Formik, React Hook Form✅)
  10. Managing Side Effects (React Query, Redux Thunk/Saga)✅

Tooling and Ecosystem

  1. Package Managers (npm, Yarn, pnpm)✅
  2. Linters and Formatters (ESLint, Prettier)
  3. Bundlers and Transpilers (Babel, Webpack)
  4. CI/CD Concepts (GitHub Actions, CircleCI, Jenkins)
  5. Code Splitting and Tree Shaking
  6. Monorepos (Nx, TurboRepo)
  7. Module Federation
  8. Micro-Frontend Architecture

Performance Optimization

  1. Code Splitting and Lazy Loading✅
  2. Minification and Bundling
  3. Critical Rendering Path Optimization
  4. Virtual DOM vs Real DOM✅
  5. Web Vitals (FCP, LCP, CLS, etc.)
  6. Asset Optimization (Images, Fonts, Videos)
  7. Debouncing and Throttling Techniques✅
  8. Rendering Optimization (Avoiding Re-renders, Memoization)

Testing

  1. Unit Testing
  2. Integration Testing
  3. End-to-End Testing (E2E)
  4. Mocking and Spying (Jest, Sinon)
  5. Test Coverage and Metrics
  6. Performance Testing
  7. Accessibility Testing

Soft Skills-Related

  1. Code Reviews and Best Practices
  2. Architecture Decision Making
  3. Collaboration with Backend Teams
  4. Debugging Strategies

Covering these topics ensures you're well-prepared for any in-depth JavaScript interview questions for a senior role.

Location: Kolkata, West Bengal, India

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