Rust Zero-Cost Abstractions

"You don't pay for what you don't use." This skill covers building high-level interfaces that compile down to efficient machine code.

Core Pillars

• Traits: Define shared behavior. Prefer impl Trait for static dispatch (fast) over dyn Trait (dynamic dispatch) unless polymorphism is required at runtime.
• Generics: Write code that works for many types using Trait Bounds to restrict functionality.
• Macros: Use declarative (macro_rules!) or procedural macros to generate boilerplate-free code at compile time.

Advanced Patterns

• Newtype Pattern: Wrapping a type to add specific behavior or safety.
• State Machine Pattern: Using enums and ownership to enforce valid state transitions at compile time.
• PhantomData: Using types to mark data that isn't physically present.

Value

These abstractions allow for "Fearless Refactoring" because the compiler enforces your design constraints strictly.