JavaScript Skills Tests
JavaScript core concepts and browser APIs
Tests
JavaScript — Beginner
Foundations: syntax, types, and runtime basics. Mix of single-answer and multiple-answer items; multi-select questions ask you to select every correct statement.
BeginnerOpenJavaScript + React — Intermediate
DOM interaction patterns, hooks rules, controlled components, list rendering, and avoiding common footguns.
IntermediateOpenJavaScript — Intermediate
Async behaviour, `this`, collections, and DOM patterns. Includes single-select and multi-select items.
IntermediateOpenJavaScript — Advanced
Semantics, proxies, concurrency primitives, and newer language features. Mix of single-select and multi-select questions.
AdvancedOpen