Rust

Install

$ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
$ source $HOME/.cargo/env

Create a new project using

$ cargo new hello_world --bin # for a binary
$ cargo new hello_world       # for a library

Exercises

Rust exercises, resolution of the rustlings exercises

Reference

Uploading to crates.io

Use

cargo publish

Static constants

“Lazy” static constants can be defined using the lazy_static macro from the lazy_static crate.

The crate can be added to the dependencies with

[dependencies]
lazy_static = "1.4.0"

and by adding to the Rust source code:

#[macro_use]
extern crate lazy_static;

Static “global” constants can then be added via:

lazy_static! {
  static ref HASHMAP: HashMap<u32, &'static str> = {
    let mut m = HashMap::new();
    m.insert(0, "foo");
    m.insert(1, "bar");
    m.insert(2, "baz");
    m
  };
}

List folders recursively

Using the glob crate:

use glob::glob;

fn main() {
    for entry in glob("./**/*.md").expect("Failed to read glob pattern") {
        match entry {
            Ok(path) => println!("{:?}", path.display()),
            Err(e) => println!("{:?}", e),
        }
    }
}

Duration between two times

Using Rust’s standard SystemTime¹, a duration between the present moment and a specific time can be calculated using:

let duration = SystemTime::now()
    .duration_since(another_system_time)
    .ok()
    .unwrap();

Footnotes

https://doc.rust-lang.org/std/time/struct.SystemTime.html↩︎