TypeScript2 min read
any vs unknown vs never (Interview-Ready)
How to choose any/unknown/never, why unknown is safer, and how never appears in narrowing and exhaustive checks.
#Interviews
Feb 08, 2026Practice
Practice
Frontend interview articles
Search by concept, narrow to a roadmap, or pick a tag to focus on the exact topic you want to rehearse.
Roadmap
Topic
75 articles · page 6 of 9
TypeScript~22 min
TypeScript Utility Types: Pick, Omit, Partial, Record (Practical Guide)
A deep, interview-ready guide to TypeScript utility types: Pick/Omit/Partial/Required/Readonly/Record, common patterns, and how to avoid over-complicating types.
#Utility Types#Interviews
Feb 08, 2026Practice
TypeScript~24 min
TypeScript Narrowing & Discriminated Unions (Interview-Ready)
A deep, interview-ready guide to narrowing in TypeScript: typeof, in, instanceof, user-defined type guards, and discriminated unions for safe, expressive code.
#Interviews
Feb 08, 2026Practice
TypeScript~20 min
TypeScript Generics: Basics, Constraints, and Real Patterns
A deep, interview-ready guide to TypeScript generics: why they exist, how inference works, constraints (extends), default generics, and practical examples used in real codebases.
#Generics#Interviews
Feb 08, 2026Practice
TypeScript~22 min
TypeScript: types vs interfaces (When to Use Which)
A deep, interview-ready guide to TypeScript types vs interfaces: extension, unions, intersections, declaration merging, and practical patterns for real codebases.
#Interviews
Feb 08, 2026Practice
Testing~22 min
Frontend Testing: Unit vs Integration vs E2E (What Interviewers Want)
A deep, interview-ready guide to frontend testing: what to test, unit vs integration vs e2e tradeoffs, reliable patterns, and common anti-patterns.
#Web Development#Interviews
Feb 08, 2026Practice
HTML~22 min
Accessibility Basics: Semantic HTML, ARIA, and Keyboard Navigation
A deep, interview-ready accessibility guide: semantic HTML first, ARIA rules, focus management, keyboard support, and common mistakes that break screen readers.
#Accessibility#Web Platform
Feb 08, 2026Practice
Web Platform~24 min
Core Web Vitals (LCP, CLS, INP): Frontend Performance That Actually Matters
A deep, practical guide to Core Web Vitals for frontend interviews: what LCP/CLS/INP measure, common causes, how to debug in DevTools, and high-impact fixes.
#Performance#Core Web Vitals
Feb 08, 2026Practice
Web Platform~22 min
Service Workers + Offline Caching (Interview-Ready Guide)
A deep, practical guide to Service Workers: lifecycle, caching strategies (cache-first, network-first, stale-while-revalidate), offline support, and common pitfalls.
#Performance#Offline
Feb 08, 2026Practice