Create a small asynchronous application in just a few steps that monitors a website.
We'll build a practical site-monitoring CLI tool step by step. Starting from an empty Cargo project, we add an HTTP client, migrate to async with Tokio, introduce a polling loop with latency tracking, add resilient error handling, and finish with user-configurable command-line arguments via clap.
Along the way we cover core Rust concepts — crates, async/await, the Result type, pattern matching, and derive macros — in the context of a tool you can actually use.
No. You work through the project step by step in your browser, and the reference code for each step saves to your disk — yours to run and keep locally.
No. The playground runs entirely in your browser — no toolchain or local setup required.
Yes. Preview steps are available without a subscription so you can see the format and quality first.
Every step unlocked, the Workbench app, a snapshot for each step, jump-to-any-step navigation, and all new playground releases.
Yes. You can work through a playground solo or alongside an AI agent.
Yes. Every step has a complete reference solution you can compare against.
