% Method Syntax
There is a new edition of the book and this is an old link.
> Methods are different from functions in that they’re defined within the context of a struct, and their first parameter is always `self`, which represents the instance of the struct the method is being called on.
```rust
# struct Rectangle {
# width: u32,
# height: u32,
# }
impl Rectangle {
fn area(&self) -> u32 {
self.width * self.height
}
}
```
---
Here are the relevant sections in the new and old books:
* **[in the current edition: Ch 5.03 — Method Syntax][2]**
* [In the first edition: Ch 3.16 — Method Syntax][1]
[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/method-syntax.html
[2]: ch05-03-method-syntax.html