Individual skill

rust-iterator-collections

Design and review Rust iterator pipelines and collection code for clear ownership, allocation, ordering, and error behavior. Use when writing, refactoring, or reviewing iterators, HashMap Entry usage, collect, FromIterator, Extend, custom iterators, or allocation-heavy loops.

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Repository last updated: Nov 6, 2026
License: Apache-2.0

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# Rust Iterator Collections

Use this skill to turn collection code into clear, idiomatic Rust. Prefer
iterator and collection APIs that express the operation directly while keeping
ownership, allocation, and error behavior visible.

## Core Workflow

1. Identify the input ownership mode: borrowed iteration, mutable iteration, or
   consuming iteration.
2. Pick the simplest iterator shape: `iter`, `iter_mut`, `into_iter`, ranges,
   `drain`, or a collection-specific method.
3. Replace manual loops with adapters only when the resulting code is clearer.
   Keep explicit loops for complex branching, early mutation, or debugging.