Lesson
generics
This lesson teaches Generics: the syntax, APIs, and habits you need before advancing in Rust.
Teams ship Generics on every Rust codebase—skipping it leaves gaps in debugging and code reviews.
You will apply Generics in contexts like: Infrastructure CLIs, proxies, game engines, blockchain nodes, and latency-sensitive backends.
Write Rust with fn main(), click Run on server—the dev runner compiles main.rs with rustc and runs the binary; fix borrow errors from stderr (requires Rust toolchain; LEARNING_RUNNER_ENABLED=true).
When you can explain the previous lesson's ideas without copying starter code.
Generics parameterize types and functions—fn largest<T>(list: &[T]). Monomorphization generates specialized code at compile time—zero runtime cost like C++ templates.
struct Point<T> { x: T, y: T }Pitfall: Generic code must only use operations valid for the type parameter—add trait bounds when calling methods.
Can you explain this lesson in 30 seconds without reading notes?
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Runs on the configured server runner (dev: npm run runner with LEARNING_RUNNER_ENABLED=true). Output appears below the editor.
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Server runner is disabled. Set LEARNING_RUNNER_ENABLED=true and LEARNING_RUNNER_URL in .env (see .env.example).
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