Reactivity interview questions
Practice 3 questions on reactivity. Each runs in a real in-browser editor with Jest tests and a worked, diagram-backed solution.
3 questions
- MEDIUM
Mini Jotai Atoms
Build atom-based state with primitive and derived atoms that recompute and notify subscribers on change.
25 minJavaScript - MEDIUM
Signals (signal / computed / effect)
PREMIUMBuild reactive signals with automatic dependency tracking so computed values and effects update on change.
25 minJavaScript - HARD
Mini MobX
Build MobX-style observables with autorun and computed that re-run when the data they read changes.
40 minJavaScript