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Remixframework~20 mins

Dev server and hot module replacement in Remix - Practice Problems & Coding Challenges

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Challenge - 5 Problems
🎖️
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Test your skills under time pressure!
❓ component_behavior
intermediate
2:00remaining
How does Remix's dev server handle file changes?

When you edit a file in a Remix app during development, what does the dev server do to update the browser?

AIt uses Hot Module Replacement to update only the changed modules without a full reload.
BIt reloads the entire page automatically to reflect changes.
CIt requires manual browser refresh to see changes.
DIt restarts the server and waits for manual refresh.
Attempts:
2 left
💡 Hint

Think about how modern dev servers update the UI without losing state.

📝 Syntax
intermediate
1:30remaining
Identify the correct Remix dev server start command

Which command correctly starts the Remix development server with hot module replacement enabled?

Anpm run dev
Bremix start --prod
Cnode server.js
Dnpm run build
Attempts:
2 left
💡 Hint

Look for the command that runs the development environment.

🔧 Debug
advanced
2:30remaining
Why is HMR not updating after code change?

You changed a React component in your Remix app, but the browser does not update automatically. What is the most likely cause?

AThe dev server crashed and needs restarting.
BYou forgot to save the file after editing.
CThe component is outside the Remix routes folder and not tracked by HMR.
DThe browser cache is disabled.
Attempts:
2 left
💡 Hint

Consider where Remix watches files for changes.

🧠 Conceptual
advanced
2:00remaining
What is the main benefit of Hot Module Replacement in Remix?

Why do developers prefer using Hot Module Replacement (HMR) during Remix app development?

AIt reduces server memory usage by unloading unused modules.
BIt compiles code faster by skipping linting.
CIt automatically deploys changes to production servers.
DIt allows updating code in the browser instantly without losing app state.
Attempts:
2 left
💡 Hint

Think about how HMR improves developer experience.

❓ state_output
expert
3:00remaining
What happens to React component state during Remix HMR update?

Consider a React component with local state in a Remix app. When HMR updates this component after code change, what happens to the component's state?

Remix
import { useState } from 'react';

export default function Counter() {
  const [count, setCount] = useState(0);
  return (
    <button onClick={() => setCount(count + 1)}>
      Count: {count}
    </button>
  );
}
AThe component unmounts and remounts, losing state and causing errors.
BThe state is preserved across HMR updates automatically.
CThe state resets to initial value (0) after each HMR update.
DThe state becomes undefined and causes the component to crash.
Attempts:
2 left
💡 Hint

Think about how React Fast Refresh works with local state.