I can’t specify the full code of the Solana “Favorite” program because it seems to be an individual implementation rather than an official anchor or Solana program. At the same time, I can give a high level of overview of what the code looks like.
Here’s an example of what the “set_favorites” feature looks like:
`rust
Use Anchor_lang :: Prelude ::*-ot;
Deklare_id! ("");
PUB CONST ANCHOR_DISCriminator_size: usize = 8;
#[program]
PUB MOD Favorites {
Use Super ::*;
/// Set a favorite on Solana Blockchain
////
/// This feature is used to set the user as their favorite, which is a special address type in the Solana ecosystem.
PUB FN SET_FAVORITES (
Context: Context
_data: & mut wad,
Favorites: Option
) -> result <(), anchorerror> {
// Check that the user has already set -e -you as their favorites
Let user = context.accounts.user;
If you leave some (favorite) = user.fav.as_ref () {
// if there is a return of an error message, indicating they cannot be repeated to their pets again
RETURN ERR (Anchorerror :: Invalidaccount);
}
// Set the user to your favorite
user.fav = some (favorite.unwrap_or (& []));
OK (())
}
}
This is just a possible implementation and you may need to change it to meet your specific use. You also need to determine the “favorites” account structure that contains the fields of the user’s favorite addresses.
Here’s an example of what the structure of “favorites” looks like:
`rust
Use Anchor_lang :: Prelude ::*-ot;
Deklare_id! ("");
PUB CONST ANCHOR_DISCriminator_size: usize = 8;
This code defines a simple “favorite” account structure with a single field, “FAV”, which is the array of strings.
The rest of the code looks like this:
`rust
Use Anchor_lang :: Prelude ::*-ot;
Deklare_id! ("");
PUB CONST ANCHOR_DISCriminator_size: usize = 8;
#[program]
PUB MOD Favorites {
Use Super ::*;
/// Set a favorite on Solana Blockchain
////
/// This feature is used to set the user as their favorite, which is a special address type in the Solana ecosystem.
PUB FN SET_FAVORITES (
Context: Context
_data: & mut wad,
Favorites: Option
) -> result <(), anchorerror> {
// Check that the user has already set -e -you as their favorites
Let user = context.accounts.user;
If you leave some (favorite) = user.fav.as_ref () {
// if there is a return of an error message, indicating they cannot be repeated to their pets again
RETURN ERR (Anchorerror :: Invalidaccount);
}
// Set the user to your favorite
user.fav = some (favorite.unwrap_or (& []));
OK (())
}
}
This code defines the “set_favorites” feature that is involved in three arguments: _data, an optional variable value that depicts the wand and the” favorites “that are the optional vector of the strings. The feature first checks that the user has already set his pet and, if any, returns an error message, indicating that they cannot be reset as a sweetheart.
If the user has not yet set themselves up as his pet, the feature will set the “FAV” field of the “User” account to the specified “Favorites”. Finally returns a success message.
