Handling Errors and Exceptions

What are Instructions?

Chapter 4: Handling Errors and Exceptions

Error handling ensures your program is robust. Anchor provides tools to define custom errors and validate conditions.

• Key Points:

  • Define errors with #[error_code].

  • Use require! for runtime checks.

  • Return errors via Result<()>.

• Code Example:

#[error_code]
pub enum MyError {
    #[msg("Account not initialized")]
    NotInitialized,
}

pub fn update(ctx: Context<Update>, new_value: u64) -> Result<()> {
    require!(ctx.accounts.my_account.is_initialized, MyError::NotInitialized);
    // Update logic
    Ok(())
}

Interactivity: Trigger different error conditions and see the corresponding error messages.