Lesson
iterators-intro
An orientation to the Rust track—how the server playground works, core vocabulary, and what you will practice next.
You need a clear map of the Rust track so ownership, borrowing, and the borrow checker do not feel like magic.
You will apply Iterators intro 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). Also read the interview prep blocks.
After HTML fundamentals and basic programming concepts—before or alongside SQL.
Iterators lazily produce items via next(). Adaptors like map, filter, collect chain without extra intermediate collections when optimized.
let sum: i32 = vec![1,2,3].iter().map(|x| x * 2).sum();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.
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