Book Image

Rust Quick Start Guide

By : Daniel Arbuckle
Book Image

Rust Quick Start Guide

By: Daniel Arbuckle

Overview of this book

Rust is an emerging programming language applicable to areas such as embedded programming, network programming, system programming, and web development. This book will take you from the basics of Rust to a point where your code compiles and does what you intend it to do! This book starts with an introduction to Rust and how to get set for programming, including the rustup and cargo tools for managing a Rust installation and development work?ow. Then you'll learn about the fundamentals of structuring a Rust program, such as functions, mutability, data structures, implementing behavior for types, and many more. You will also learn about concepts that Rust handles differently from most other languages. After understanding the Basics of Rust programming, you will learn about the core ideas, such as variable ownership, scope, lifetime, and borrowing. After these key ideas, you will explore making decisions in Rust based on data types by learning about match and if let expressions. After that, you'll work with different data types in Rust, and learn about memory management and smart pointers.
Table of Contents (10 chapters)

Types with generic type parameters

When a data type has generic type parameters, it's not, strictly speaking, actually a data type at all. It is a whole family of data types. Let's look at Option for a moment. Option is defined as follows:

pub enum Option<T> {

This means that it has one generic type parameter with the name T. If we try to use Option without specifying a type for that generic type parameter, Rust will report an error:

let x: Option = None;

It produces this error:

What that's telling us, in essence, is that Option isn't a usable data type. However, Option<u32> is, as is Option<String>, Option<Result<f64, String>>, and so on. Moreover, Option<u32> and Option<String> are not the same type, and Rust won't pretend that they are. They're two different data types that have the...