How does the module system (mod, use, crates) structure Rust applications?

Explanation & Concept

Rust organizes code hierarchically: • Package: A Cargo project containing a `Cargo.toml` and one or more crates. • Crate: A compilation unit (binary `main.rs` or library `lib.rs`). • Module: Declared via `mod`, organizing privacy boundaries (`pub` vs private by default).

Code Example

rust

// In src/network/mod.rs
pub mod client {
    pub fn connect() {
        println!("Connected to network.");
    }
}

// In src/main.rs
mod network;
use network::client;

fn main() {
    client::connect();
}

How It Works & Key Takeaways

Items in Rust are private by default, enforcing strict encapsulation and explicit public interfaces.

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rust

How does the module system (mod, use, crates) structure Rust applications?

Explanation & Concept

Code Example

rust

// In src/network/mod.rs
pub mod client {
    pub fn connect() {
        println!("Connected to network.");
    }
}

// In src/main.rs
mod network;
use network::client;

fn main() {
    client::connect();
}

How It Works & Key Takeaways

Items in Rust are private by default, enforcing strict encapsulation and explicit public interfaces.

Mock Test · 1 Questions · Optional

Ready for Iterators?

Take a quick test to evaluate yourself, or move straight to the next module.

Intermediate1 questions

Skip