Solana: While Building the Favorites Program in solana

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I can’t share the full code for the Solana “Favorites” program, since it’s likely a custom implementation and not an official Anchor or Solana program. However, I can give you a rough outline of what the code might look like.

Here’s an example of what the set_favorites function might look like:

use anchor_lang::prelude::*;
declare_id!("");
pub const ANCHOR_DISCRIMINATOR_SIZE: use size = 8;
#[program]
pub mod favorites {
use super::*;
/// Set as favorite on the Solana blockchain
///
/// This function is used to set a user as a favorite, which is a special type of address in the Solana ecosystem.
pub fn set_favorites(
context: Context,
_data: &mut Wad,
favorites: Option<Vec>,
) -> Result {
// Check if the user has already set themselves as a favorite
let user = context.accounts.user;
if let Some(favorites) = user.fav.as_ref() {
// If so, return an error message saying that they cannot be re-favorited
return Error ( AnchorError : : InvalidAccount );
} }
// Set the user as your favorite
user.fav = Some(favorites.unwrap_or(&[]));
OK(())
} }
} }

This is just one possible solution and may need to be modified to fit your specific use case. You will also need to define a “Favorites” account structure that contains fields for the user’s favorite addresses.

Here is an example of what the “Favorites” structure might look like:

use anchor_lang::prelude::*;
declare_id!("");
pub const ANCHOR_DISCRIMINATOR_SIZE: use size = 8;

This code defines a simple “Favorites” account structure with one field “fav”, which is an array of strings.

The rest of the code would look like this:

use anchor_lang::prelude::*;
declare_id!("");
pub const ANCHOR_DISCRIMINATOR_SIZE: use size = 8;
#[program]
pub mod favorites {
use super::*;
/// Set as favorite on Solana blockchain
///
/// This function is used to set a user as favorite, which is a special type of address in Solana ecosystem.
pub fn set_favorites(
context: Context,
_data: &mut Wad,
favorites: Option<Vec>,
) -> Result {
// Check if user has already set as favorite
let user = context.accounts.user;
if let Some(favorites) = user.fav.as_ref() {
// If so, return an error message saying that they can't be re-favorited
return Error ( AnchorError : : InvalidAccount );
} }
// Set a user as your favorite
user.fav = Some(favorites.unwrap_or(&[]));
OK(())
} }
} }

This code defines a function set_favorites that takes three arguments: _data, which is an optional mutable value representing the Wad, and favorites, which is an optional vector of strings. The function first checks if the user has added themselves to favorites. If so, it returns an error message saying that they can’t be re-favorited.

If the user has not yet marked themselves as favorites, the function sets the fav field of the user account to the given favorites. Finally, it returns a success message.