Code Labs · UI systems
React Machine Coding
Practice the component-building work behind frontend interviews—with real interaction states, browser behavior, and implementation trade-offs.
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Question index
59 questionsReact Tic-Tac-Toe EngineMedium
Performant Image SliderMedium
API Search and Render ImagePROMediumAccessible React TabsEasy
Recursive File ExplorerMediumTraffic LightMediumStar RatingPROEasyAccordionEasyAuto-completePROHardModal SystemMediumPaginationPROMediumMulti-step FormMediumToast NotificationPROHardVirtual List (Windowing)PROHard
Custom Query HookPROHardKanban Board (DnD)HardNested Checkboxes (Tri-state)PROHardProduct DashboardPROHardForm Builder (JSON Schema)PROHardInfinite ScrollPROHardAnalog ClockPROMediumMemory GamePROHardPoll WidgetPROMediumTransfer ListPROHardProgress BarPROEasyStopwatchEasy
TooltipEasy
Color SwatchEasy
Like Dislike IEasy
Like Dislike IIPROMedium
Nested CommentsPROMediumNode UnwinderPROMediumDrag and Drop Sortable ListPROHard
Configurable Text TransformerPROMediumCard Deck IEasyCard Deck IIPROMedium
Card Deck IIIPROHard
Progress Bar IEasy
Progress Bar IIPROMedium
Progress Bar IIIPROHardTree Navigation IEasyTree Navigation IIPROMediumTree Navigation IIIPROHardTic Tac Toe IIIPROHard
AI Streaming Chat WindowMediumSlash-Command Prompt InputMedium
AI Citations PanelPROMediumAI Inline Diff ViewerPROHardAI Agent Trace RendererPROHarduseArrayPROMediumuseCounter IIPROEasyUpload Queue with ProgressPROHard
OTP Verification InputEasyRestaurant Menu Cart PricingPROMedium
Realtime Order TrackerPROHardProduct Listing with API RetryMediumAI Model Picker + Cost/Latency BadgeMediumAI Tool-Call Cards in ChatPROHardAI Speculative / Optimistic Token UIPROHard
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