Lesson
types-scalars
This lesson teaches Scalar types: the syntax, APIs, and habits you need before advancing in Rust.
Teams ship Scalar types on every Rust codebase—skipping it leaves gaps in debugging and code reviews.
You will apply Scalar types 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.
Rust has fixed-size integers, floats, booleans, and characters. Type inference works locally but functions often need explicit signatures.
i32, u64 — signed/unsigned integersf64 — default floatbool — true/falsechar — Unicode scalar in single quotesi32 when unspecified in many contexts.'🦀'?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.
Code runner not available
Server runner is disabled. Set LEARNING_RUNNER_ENABLED=true and LEARNING_RUNNER_URL in .env (see .env.example).
Multiple choice — immediate feedback.
Learner essays linked to Rust — not official lesson content.
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