Build a CLI Word Counter
Your first real Rust program: read files from the command line, count words, and handle errors like a grown-up.
Learn Rust by building things.
Every project here is a guided build, split into small parts. Start at part 0, ship something that runs, then keep going.
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Projects
12 totalGuessing Game, Then a TUI
The classic number guessing game, then rebuilt as a real terminal UI with ratatui.
Write a JSON Parser
Build a parser from scratch: an enum for the data model, a hand-written tokenizer, and recursive descent.
An HTTP Server from Sockets Up
No framework. Parse requests off a TcpStream, route them, and then make it concurrent with threads.
Linked Lists and the Borrow Checker
The famous hard exercise. Build a list four ways and learn what Box, Rc, and RefCell actually buy you.
An Async Web Scraper
Tokio, reqwest, and structured concurrency: fetch hundreds of pages without hammering the server.
A Persistent Key-Value Store
An append-only log, an in-memory index, and compaction — the core of how real databases work.
Game of Life in WebAssembly
Compile Rust to wasm, drive a canvas from JavaScript, and find out where the real cost is.
A Tiny ECS and a Particle Sim
Build an entity-component-system from scratch, then use it to push a hundred thousand particles.
Write a Derive Macro
Procedural macros demystified: parse a struct with syn, generate code with quote, and report errors properly.