comprehensive-rust/src/control-flow-basics/blocks-and-scopes.md

---
minutes: 5
---

# Blocks and Scopes

## Blocks

A block in Rust contains a sequence of expressions, enclosed by braces `{}`.
Each block has a value and a type, which are those of the last expression of the
block:

```rust,editable
fn main() {
    let z = 13;
    let x = {
        let y = 10;
        println!("y: {y}");
        z - y
    };
    println!("x: {x}");
}
```

If the last expression ends with `;`, then the resulting value and type is `()`.

<details>

- You can show how the value of the block changes by changing the last line in
  the block. For instance, adding/removing a semicolon or using a `return`.

</details>