Certainly! Below is a simple example of a function in JavaScript that retrieves a list of badges earned by a user using the Nostr Development Kit (NDK). This example assumes you have access to the NDK and have set it up in your project.
```javascript
// Import the NDK library
const NDK = require('ndk');
// Initialize the NDK instance
const ndk = new NDK({
// Configuration options, such as API endpoint or authentication
});
// Function to retrieve badges earned by a user
async function getUserBadges(userPubKey) {
try {
// Fetch user data from Nostr
const userData = await ndk.getUserData(userPubKey);
// Check if the user has badges
if (userData && userData.badges) {
return userData.badges;
} else {
return [];
}
} catch (error) {
console.error('Error fetching user badges:', error);
return [];
}
}
// Example usage
const userPubKey = 'npub1tsgw6pncspg4d5u778hk63s3pls70evs4czfsmx0fzap9xwt203qtkhtk4';
getUserBadges(userPubKey).then((badges) => {
console.log('User badges:', badges);
});
```
In this example:
1. We import the NDK library.
2. We initialize an NDK instance with any necessary configuration options.
3. We define an asynchronous function `getUserBadges` that takes a user's public key as an argument.
4. Inside the function, we use `ndk.getUserData` to fetch the user's data from Nostr.
5. We check if the user data includes badges and return them; otherwise, we return an empty array.
6. We handle any errors that might occur during the data retrieval process.
7. Finally, we demonstrate how to use the function with an example public key.
Make sure to replace the placeholder configuration options with actual values relevant to your NDK setup. Also, ensure that the NDK library is properly installed and configured in your project.
