/learn-rust

Primary LanguageRust

Learn Rust

12/24/22 - https://doc.rust-lang.org/book/

Chapter 01 Notes; 12/24

  • println!("string"); -- name!() run a macro,name() run a function.
  • rustc -- compiler
  • cargo -- is the tool chain
    • cargo new project_name -- new dir and scaffolding in project_name -- note it's a git init'd repo
    • cargo build -- makes a binary in target dir
    • cargo run -- builds and runs
    • cargo check -- doesn't run or build, just syntax check
    • cargo build --release -- makes a prod version

Typical workflow;

$ git clone example.org/someproject
$ cd someproject
$ cargo build

Note: rm -r chapter-01/hello_cargo/.git so that I have a single repo for this.

Chapter 02 Notes; 12/24

let apples = 5; // immutable
let mut bananas = 5; // mutable

Immutable by default, mut is mutable.

  • .read_line(&mut guess) -- & indicates a reference
  • .expect("msg') -- echos msg on error
  • {var} -- var interpolation
let x = 5;
let y = 10;

println!("x = {x} and y + 2 = {}", y + 2);

Dependencies default to carat, "0.x.y" is "^0.x.y" (in Cargo.toml), run cargo build to bring new deps in.