Rust Macros
Rust macros are a metaprogramming feature that allows developers to write code that writes other code at compile time, enabling code generation, domain-specific languages, and compile-time validation. They come in two main types: declarative macros (using pattern matching) and procedural macros (operating on token streams). Macros help reduce boilerplate, enforce invariants, and create expressive abstractions beyond what functions can achieve.
Developers should learn Rust macros when building libraries, frameworks, or applications that require code reuse, compile-time checks, or custom syntax extensions, such as in serialization, logging, or testing tools. They are essential for advanced Rust programming to improve code maintainability and performance by shifting work to compile time, but should be used judiciously due to complexity and debugging challenges.