A comprehensive collection of 200+ JavaScript interview questions organized by topic, ranging from beginner to advanced. Perfect for 4+ years software engineer interview preparation.

#	Topic	Description
1	JavaScript Fundamentals	Data types, var/let/const, hoisting, closures, this, functions, scoping
2	Objects, Prototypes & Classes	Prototype chain, classes, inheritance, getters/setters, property descriptors
3	Arrays & Collections	Array methods, Map, Set, WeakMap, WeakSet, iterators, generators
4	ES6+ & Modern JavaScript	Destructuring, spread, modules, Proxy, Symbol, latest ECMAScript features
5	Asynchronous JavaScript	Event loop, promises, async/await, microtasks vs macrotasks, AbortController
6	DOM & Browser APIs	Event delegation, localStorage, requestAnimationFrame, Service Workers, Web APIs
7	Advanced Topics & System Design	Memory management, V8 internals, design patterns, architecture, performance
8	Trick Questions — Code Output	40+ tricky JS code output questions — type coercion, equality, hoisting, references, closures, event loop

• Explain your thought process — interviewers want to know how you think
• Start simple, then add complexity (edge cases, performance, trade-offs)
• Know the tradeoffs — there’s rarely one right answer
• Practice coding common utilities from scratch: debounce, deepClone, Promise.all
• Understand the WHY behind language features, not just the what

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Good luck with your interview! 🚀