Skip to content

⚡ 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

Ranked by how often each question comes up in real interviews. #1 is the most common.

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🔒