Rust

Install and update

Install Rustup & Rust:

curl https://sh.rustup.rs -sSf | sh

Update Rust:

rustup update

Documentation:

Rust documentation

rustup doc

Cargo documentation

https://doc.rust-lang.org/cargo/.

Per project documentation

cargo doc --open

Formatting tool:

cargo fmt -- --check

New project:

cargo new hello_cargo --bin

Build:

cargo build
cargo build --release

Build & Run:

cargo run
cargo run --release

Updating crates including Cargo.lock file:

cargo update

Checking for errors when building

Check for errors without building: cargo check

Language

Printing text:

println!("You guessed: {}", guess);

Bring a library into scope:

use std::io;

Creating a variable:

let foo = bar; // immutable
Let mut foo = String::new(); // mutable

Shadowing:

You can shadow a variable to avoid having to create another one.

let mut guess = String::new()
let guess : u32 = guess.trim().parse().expect("enter a number!");

Reference:

&foo // immutable reference
&mut foo // mutable reference

Macros:

Calling a macro (like println!) you put an exclamation mark at the end.

Statements and expressions:

Statements end in a semicolon don’t return a value Expressions have no semicolon and return a value.

Statement:

let x = 3;

Expressions:

{ let x = 3; x +1 } // Returns x+1
if (x == 3) { 5 } else { 3 }

Config

Using a crate:

• Packages in Rust are called crates.
• Specify the dependency in the Cargo.toml file, eg: rand = “0.3.14”
• Reference it at the top of your file: extern crate rand; and use rand::Rng