learning-rust

A repository with Rust lessons.

1. Using cargo

You can do several things with cargo, like:

Create a new project: cargo new project_name
Build the project: cargo build
Run the project: cargo run
Check the project: cargo check
Test the project: cargo test
Build the project for release: cargo build --release
Generate the project documentation: cargo doc
Publish the project to crates.io: cargo publish (you need to have an account on crates.io and set the CARGO_REGISTRY_TOKEN environment variable with the token)
Install a binary: cargo install binary_name
Uninstall a binary: cargo uninstall binary_name
Update the dependencies: cargo update

More info can be found at The Cargo Book.

By default, variables are immutable in Rust. To make them mutable, you need to use the mut keyword.

let x = 5; // Immutable
let mut y = 10; // Mutable

There are four primary scalar types in Rust:

Integers: i8, i16, i32, i64, i128, u8, u16, u32, u64, u128, isize, usize
- isize and usize depend on the kind of computer your program is running on: 64 bits if you're on a 64-bit architecture and 32 bits if you're on a 32-bit architecture.
Floating-point numbers: f32, f64
Booleans: bool
Characters: char

Example of isize and usize:

let x: isize = 10;

// Print size of x
println!("Size of x: {}", std::mem::size_of_val(&x));