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⚡ Interview Prep

JavaScript

Closures, this, promises, the event loop, and the utility functions front-end and full-stack interviews ask you to build by hand.

100 questions, most asked first

Ordered so the most useful questions for learning each pattern come first.

Any difficulty Easy Medium Hard

All patterns Scope & closures Event loop Types & coercion Build it yourself this & prototypes Async & promises Arrays & objects References & copying Modern syntax

Unlock 3 more JavaScript questions · all 1,200 questions for $39/year (about 11¢ a day)See full access #40Microtasks vs macrotasksEvent loopHard🔒#60Implement a simple PromiseAsync & promisesHard🔒#69Run async tasks with a concurrency limitAsync & promisesHard🔒