Understanding Variables and Types in Rust

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; } }

• 49:17 SIIIIICK ××× PIIIICKS ×××

××× SIIIIICK ××× PIIIICKS ×××

• Scott: Thermacell Patio Shield
• Wes: Magnet Phone Mount

Shameless Plugs

• Scott: Sentry
• Wes: Wes Bos Tutorials

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