Rust Basics

Bind values and print them.

Rust

fn main() {
    let name = "Ada";
    println!("Hello, {}", name);
}

Output

Hello, Ada

Explanation

let creates a binding. println! is a macro that formats and writes a line. Bindings are immutable unless declared mut.

Explore the dry run

Guided walkthroughReady

1fn main() {

2 let name = "Ada";

3 println!("Hello, {}", name);

4}

Start to inspect the source, values, and output. These prepared steps explain the published sample; grouped loop steps describe multiple iterations.

View the complete dry-run table

Prepared trace of the published program. Some rows group repeated iterations.
Step / line	What happens	State after step	Output so far
	Bind an immutable string slice to name.	`name = "Ada"`	—
	The macro substitutes name into the placeholder.	`name = "Ada"`	Hello, Ada