Immutability prevents accidental changes across large codebases. It’s your friend. Constants const MAX_POINTS: u32 = 100_000; // always immutable, type required. 4. Shadowing (Not Mutation) You can redeclare a variable name:
let mut v = Vec::new(); v.push(1); v.push(2); let v2 = vec![1, 2, 3]; // macro
Rust is famously loved for its memory safety, blazing speed, and excellent tooling. It’s also famously feared for its borrow checker and steep learning curve. This crash course strips away the complexity, giving you a mental model of Rust that works.
Example: reading a file
enum IpAddrKind V4(u8, u8, u8, u8), V6(String),
let s = String::from("hello world"); let hello = &s[0..5]; // type: &str let world = &s[6..11]; String literals are &str (immutable slices). struct User active: bool, username: String, sign_in_count: u64,
Immutability prevents accidental changes across large codebases. It’s your friend. Constants const MAX_POINTS: u32 = 100_000; // always immutable, type required. 4. Shadowing (Not Mutation) You can redeclare a variable name:
let mut v = Vec::new(); v.push(1); v.push(2); let v2 = vec![1, 2, 3]; // macro ultimate rust crash course
Rust is famously loved for its memory safety, blazing speed, and excellent tooling. It’s also famously feared for its borrow checker and steep learning curve. This crash course strips away the complexity, giving you a mental model of Rust that works. This crash course strips away the complexity, giving
Example: reading a file
enum IpAddrKind V4(u8, u8, u8, u8), V6(String), let s = String::from("hello world")
let s = String::from("hello world"); let hello = &s[0..5]; // type: &str let world = &s[6..11]; String literals are &str (immutable slices). struct User active: bool, username: String, sign_in_count: u64,