50 core Rust coding conventions covering naming, data types, strings, error handling, memory, concurrency, async, and modern crate recommendations. Use when reviewing code style or setting up project conventions.
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| Rule | Guideline |
|---|---|
No get_ prefix | fn name() not fn get_name() |
| Iterator convention | iter() / iter_mut() / into_iter() |
| Conversion naming | as_ (cheap ref), to_ (expensive), into_ (ownership) |
| Constants | SCREAMING_SNAKE_CASE for const/static |
| Rule | Guideline |
|---|---|
| Use newtypes | struct Email(String) for domain semantics |
| Prefer slice patterns | if let [first, .., last] = slice |
| Pre-allocate | Vec::with_capacity(), String::with_capacity() |
| Avoid Vec abuse | Use arrays for fixed sizes |
| Rule | Guideline |
|---|---|
| Prefer bytes | s.bytes() over s.chars() when ASCII |
Use Cow<str> | When might modify borrowed data |
Use write! | Over string concatenation with + |
| Avoid nested iteration | contains() on string is O(n·m) |
| Rule | Guideline |
|---|---|
Use ? propagation | Not try!() macro |
expect() over unwrap() | When value is guaranteed |
| Assertions for invariants | assert! at function entry |
| Rule | Guideline |
|---|---|
| Meaningful lifetimes | 'src, 'ctx not just 'a |
try_borrow() for RefCell | Avoid panic |
| Shadowing for transformation | let x = x.parse()? |
| Rule | Guideline |
|---|---|
| Identify lock ordering | Prevent deadlocks |
| Atomics for primitives | Not Mutex for bool/usize |
| Choose memory order carefully | Relaxed/Acquire/Release/SeqCst |
| Rule | Guideline |
|---|---|
| Sync threads for CPU-bound | Async is for I/O |
| Don't hold locks across await | Use scoped guards |
| Rule | Guideline |
|---|---|
| Avoid unless necessary | Prefer functions/generics |
| Follow Rust syntax | Macro input should look like Rust |
| Deprecated | Better | Since |
|---|---|---|
lazy_static! | std::sync::OnceLock | Rust 1.70 |
once_cell::Lazy | std::sync::LazyLock | Rust 1.80 |
std::sync::mpsc | crossbeam::channel | — |
std::sync::Mutex | parking_lot::Mutex | — |
failure/error-chain | thiserror/anyhow | — |
try!() | ? operator | 2018 edition |
Naming: snake_case (fn/var), CamelCase (type), SCREAMING_CASE (const)
Format: rustfmt (just use it)
Docs: /// for public items, //! for module docs
Lint: #![warn(clippy::all)]
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Apple's approach to interface design and fluid, physical motion, translated for the web. Use when building or reviewing gesture-driven UI, spring animations, drag/swipe/sheet interactions, momentum and interruptible transitions, translucent materials and depth, typography (optical sizing, tracking, leading), reduced-motion, or the design foundations (feedback, spatial consistency, restraint) behind Apple-style interfaces.
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Babysit a GitHub pull request during a user-approved monitoring window by polling review comments, CI checks/workflow runs, and mergeability state. Diagnose failures, retry likely flaky failures up to 3 times, auto-fix/push branch-related issues when appropriate, and report fresh review feedback. Use when the user asks Codex to monitor a PR, watch CI, handle review comments, or keep an eye on failures and feedback on an open PR.
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