Hands-on Rust

Formatting Your Code

When you’re sharing your code with others, it’s helpful to have a standardized layout for your code. Rust provides a style guide, but it can be difficult to remember.^[13] Rust includes a formatter that can help you adhere to the standard. The command cargo fmt will reformat your code to follow the Rust style guide.

Suppose you were in a hurry and wrote “Hello, World!” as a one-line program:

fn main() { println!("Hello, world!"); }

This program will compile and run, but it’s very different from the recommended style guide. If you were to share it with your coworkers or as part of an open-source project, you would likely receive comments on the formatting. You can run cargo fmt to transform the terse code back into ...