Type Aliases

Use type aliases to create shorter names for complex types.

Difficulty

Beginner

Code

type Kilometers = i32;
type Thunk = Box<dyn Fn() + Send + 'static>;

fn main() {
    let distance: Kilometers = 5;
    println!("{} km", distance);

    let f: Thunk = Box::new(|| println!("called!"));
    f();
}

Explanation

Type aliases create shorter names for complex types. They are syntactic sugar, not new types.

Key Concepts

• Read the code carefully and understand the data flow
• Try modifying the example to see how it changes behavior
• Run this code in the Rust Playground

Related Topics

Browse more examples in the basics category to build a complete understanding of this topic.