The Opposite of Spaghetti Code: Building for Understanding
summary
A concrete cache is built and evolved: start with a HashMap, add a struct with methods, then tighten ownership and privacy into modules and privacy so the cache controls its own invariants. Trait-based interfaces provide dependency injection and traits as type-level privacy, letting a separate cache-metrics module compute hits and misses without knowing implementation details. The demo shows error-message improvements, uses generics, phantom data and a builder, and argues Rust’s zero-cost abstractions enforce separation while keeping performance, ending with an any-cache composition that works.
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chapters (4)
- 0:00Start
- 13:47Error Messages
- 25:49Implementation Delegation Pattern
- 28:58What It Takes To Build an Ecosystem
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