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)

Variable assignment with pattern matching

We've seen many times how to assign a variable in Rust: we do something like let x = y;, which tells Rust to create a new variable named x and move or copy the value stored in y into it, as appropriate to the data type.

However, that's actually just a simplified case of what Rust is really doing, which is matching a pattern to a value and extracting data values from that matched pattern to store in the target variables, as in the following example:

pub struct DemoStruct {
pub id: u64,
pub name: String,
pub probability: f64,
// ...
let source1 = DemoStruct { id: 31, name: String::from("Example Thing"), probability: 0.42 };

let DemoStruct{ id: x, name: y, probability: z } = source1;

Okay, what just happened? First of all, we have a structure definition. We've seen those before, and the only new thing here is that we...