Skip to content

Tracks Drills Topics Technologies Tech stacks Skill areas

Tracks Drills Topics

Loading

Aporeon interview preparation

About Privacy Terms

React & Next.js Frontend Foundations

Hooks, Effects & Data

useEffect, cleanup, stale closures, client data fetching, cache freshness, and refetching.

6 drillsPractice one at a timeOrdered pathConcept question

Recommended start

useEffect Dependencies

Explains what useEffect is for, how dependencies work, and how to avoid stale or runaway effects.

Medium~7 minStep 1 of 6

Practice this drill Choose another

Search

6 of 6 shown

1useEffect DependenciesRecommended startExplains what useEffect is for, how dependencies work, and how to avoid stale or runaway effects.Concept questionMedium~7 minReactTypeScriptPractice 2Effect CleanupExplains cleanup for subscriptions, timers, event listeners, and aborting stale fetches.Concept questionMedium~7 minReactTypeScriptPractice 3Stale ClosuresExplains stale closures in callbacks, effects, timers, subscriptions, and how to fix them cleanly.Concept questionHard~9 minReactTypeScriptPractice 4Client Data FetchingExplains loading, error, empty, success, refetch, stale data, and request lifecycle in client-rendered React.Concept questionMedium~7 minReactTypeScriptPractice 5Frontend CacheExplains client cache keys, freshness, invalidation, refetching, optimistic updates, and server truth.Concept questionMedium~7 minReactTypeScriptPractice 6Custom Hook DesignExplains how custom hooks share stateful behavior while preserving ownership, lifecycle, and a focused contract.Concept questionMedium~7 minReactTypeScriptPractice

Practice order

6 drillsOne at a time

1useEffect DependenciesUp next / Medium / ~7 min
2Effect CleanupMedium / ~7 min
3Stale ClosuresHard / ~9 min
4Client Data FetchingMedium / ~7 min
5Frontend CacheMedium / ~7 min
6Custom Hook DesignMedium / ~7 min