4_mod

Learn how organize code

Our cli have two functionalities (greetings and chifoumi)
It is always better to split logic in different files

🎯 Objectives

• use modules

Organize code in modules

Modules and use Let you control the organization, scope, and privacy of paths

Let split our code in differents files

|-src
  |- main.rs
  |- greetings.rs

// greetings.rs
pub fn greets(name: &str) {
    println!("Hello, {} 🦀 !", name);
}

Nb: functions are private by defaut, you must add pub keyword

// main.rs
use std::env;

mod greetings; //declare module 
use greetings::greets; // import function

fn main() {
    let args: Vec<String> = env::args().collect();

    let name = args.get(1).expect("Name is required");
    greets(&name);
}

📌 Remember

• declare module and declare usage
• visibibility is private by default

📚 More resources

• crates and modules

📝 Exercice: Split app in different modules

Expected tree

|-src
  |- main.rs
  |- greetings.rs
  |- chifoumi.rs

💡 Tips

• do not forget visiblity

👏 Congrats

you understand how to organize code in modules

Check a solution with unit tests here

📝 Summary

What you have learned

• modules
• visibility

Next Part

🤙 Go to next part: Clap