This repository is a comprehensive, hands-on Rust course consisting of ~100 exercises that progressively teach Rust's core concepts, from basic syntax and ownership to concurrency and async programming. It is structured as a monorepo with a book (mdbook) and a set of exercise crates, each with its own tests. The code is well-crafted, demonstrating idiomatic Rust patterns such as newtypes with validation, error handling via thiserror, and safe concurrency with channels and locks. While not a production application, the exercises serve as a high-quality reference for Rust best practices and are actively maintained by Mainmatter.

ember-simple-auth is a lightweight Ember.js addon for implementing authentication and authorization in Ember applications. It provides a session service, pluggable authenticators (OAuth2 password grant, implicit grant, Devise, Torii, and custom), and session stores (localStorage, sessionStorage, cookie, adaptive, ephemeral) that persist the session across page reloads and synchronize across browser tabs. The library supports FastBoot, Engines, and Embroider, and includes built-in test helpers. Architecture follows a service-based pattern where the session service delegates to an internal session module that manages state transitions (unauthenticated, authenticated, loading) and communicates with authenticators and stores via events. The codebase is partially migrated to TypeScript, uses modern tooling (pnpm workspaces, Rollup, eslint flat config), and maintains broad compatibility with Ember versions from 3.28 onward.