RN

Daily drill

Today's Session

The 20-minute loop, assembled for you: the cards spaced repetition says you're about to forget, plus a coding and a system-design prompt. Finish it daily and keep the streak alive.

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548 cards due · today's set: 12 cards + 2 prompts

Today's cards — grade each by confidence

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LevelShowing 12
Grade a card → it reschedules. Drill Due daily.

Today's prompts — try before you reveal

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Level
  1. CodeMid

    Build a useDebounce hook

    hooksperformancetimers

    Write a generic useDebounce<T>(value, delay) hook that returns a debounced copy of value which only updates after the input has been stable for delay milliseconds. A classic use is debouncing a search box before firing a query.

    next: new
  2. DesignArchitect

    Real-time chat for a private-markets app

    real-timewebsocketsofflinesyncchat

    You are architecting the messaging layer of Valt Connect, a private-markets app where deal teams chat about confidential transactions on Twilio Conversations. Threads must feel instant, survive flaky elevator/garage networks, never duplicate or reorder a message, and load months of history smoothly.

    Design the client-side chat system end to end: transport choice, message ordering & dedup, an offline send queue, presence/typing, and history pagination. Walk through what happens to a message sent while the device is fully offline and how it reconciles when the socket reconnects.

    next: new