Instructions and Processing

What are Instructions?

Lesson 4: Instructions and Processing

Chapter 2: Defining Instructions in Anchor

In this chapter, you’ll learn how to define instructions using the Anchor framework, which simplifies Solana program development. Instructions are the entry points to your program’s logic, and Anchor provides macros to streamline their creation.

• Key Points:

  • Use the #[program] macro to define your program module.

  • Instruction functions take a Context parameter and optional data.

  • Anchor handles serialization and deserialization automatically.

  • Example

use anchor_lang::prelude::*;

declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");

#[program]
pub mod my_program {
    use super::*;

    pub fn initialize(ctx: Context<Initialize>) -> Result<()> {
        // Initialization logic here
        Ok(())
    }

    pub fn update(ctx: Context<Update>, new_value: u64) -> Result<()> {
        // Update logic here
        Ok(())
    }
}

• Interactivity: You can modify the instruction definitions (e.g., add a new parameter) in an interactive editor and see real-time feedback on how it affects the program structure.