type-design-performance
Type Design for Performance
When to Use This Skill
Use this skill when:
- Designing new types and APIs
- Reviewing code for performance issues
- Choosing between class, struct, and record
- Working with collections and enumerables
Core Principles
- Seal your types - Unless explicitly designed for inheritance
- Prefer readonly structs - For small, immutable value types
- Prefer static pure functions - Better performance and testability
- Defer enumeration - Don't materialize until you need to
- Return immutable collections - From API boundaries
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