In addition, Julia's metaprogramming capabilities allow for powerful code introspection and the ability to programmatically interact with the language's compiler. This opens up possibilities for advanced optimization techniques and dynamic code generation.

One lesser-known feature of metaprogramming in Julia is the ability to define new syntactic constructs using macros. This allows you to extend the language's syntax and create domain-specific languages for specific problem domains.

Another lesser-known feature is the ability to generate new code at compile-time using macro expressions. This can be useful for optimizing performance or generating boilerplate code automatically.

Julia also provides a powerful reflection system that enables you to inspect and manipulate the structure of code at runtime. This can be handy for tasks such as automatic code generation, debugging, and code analysis.