Rust for JS Devs — Part 2

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

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("[email protected]"),
    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 ×××

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