Rust for JS Devs — Part 2

   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   

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

   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;     } }   

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 Tweet us your tasty treats Scott’s Instagram LevelUpTutorials Instagram Wes’ Instagram Wes’ Twitter Wes’ Facebook Scott’s Twitter Make sure to include @SyntaxFM in your tweets Wes Bos on Bluesky Scott on Bluesky Syntax on Bluesky