Variables, Type System, and Integer Types in Rust

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This chapter explores the topics of variables, the type system, and integer types in Rust. It discusses how variables work in Rust, the concept of immutability and mutable variables, and the use of 'const'. The chapter also compares the type system in Rust with TypeScript and highlights the powerful type inference. Additionally, it explains the benefits of using integers in Rust compared to JavaScript and delves into the differences between signed and unsigned integers.

In this episode of Syntax, Wes and Scott jump into part 2 of their look at Rust for JavaScript developers, including variables in Rust, type systems in Rust, signed and unsigned integers, and more.

Show Notes

00:10 Welcome
00:43 Audio issue bugs
03:17 Building decks
06:06 Variables in Rust
Syntax 647: Rust for JavaScript Developers - Node vs Rust Concepts

let x = 5; // x is immutable let mut x = 5; // x is mutable const MAX_POINTS: u32 = 100_000; // must be defined at compile time

10:42 Type System in Rust
15:52 Types in Rust
19:06 Why does Rust have signed and unsigned integers?
23:35 Slicing strings with &str
27:35 enum
27:55 struct
28:19 Vec
29:33 HashMap and HashSet
33:00 Converting Signed to Unsigned Numbers

let unsigned_value: u8 = 200; let signed_value: i8 = unsigned_value as i8;

36:12 What’s up with &str?
43:31 Rust error messages
45:28 What is a Struct?

struct User { username: String, email: String, sign_in_count: u64, active: bool, } // You can create an instance of a struct like this: let user1 = User { email: String::from("someone@example.com"), username: String::from("someusername123"), active: true, sign_in_count: 1, }; impl User { fn login(&mut self) { self.login_count += 1; } }