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Rust 1.27.0

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.

impl Rectangle {
    fn area(&self) -> u32 {
        self.width * self.height

Here are the relevant sections in the new and old books: