struct-keyword-for-structures

struct keyword for custom data types

A Rust struct is a custom data type that groups related data and functions. A struct is defined using the struct keyword, followed by the name of the struct, and a block of curly braces that contains the fields of the struct.

Here is an example of a struct in Rust:

struct Rectangle {
    width: u32,
    height: u32,
}

Usage:

let r = Rectangle {
    width: 10,
    height: 20
};

Structs can also have functions associated with them, called methods. Methods are defined within the block of curly braces after the fields of the struct, and can be used to operate on the data within the struct.

Example methods:

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

This example uses impl to define an implementation block for the Rectangle struct, and defines a method named area that calculates the area of the rectangle. The &self parameter indicates that the method takes a reference to the struct as its first argument.