A developer introduces grist_lens, a new Rust library that improves lens ergonomics through procedural macros. The article explains lens concepts in Rust and critiques existing solutions like lens-rs and pl-lens for being too clunky. The author shares implementation details and pros/cons of their approach for better partial borrowing patterns.
Background
Lenses in Rust are functional programming constructs that enable advanced field borrowing patterns, allowing partial borrows of struct fields while maintaining borrow checker compliance. Several libraries exist but often suffer from ergonomic issues.
- Source
- Lobsters
- Published
- Apr 18, 2026 at 10:42 AM
- Score
- 5.0 / 10