Macros
summary
Claims macros let code inspect and transform ASTs so you can build things impossible with functions — an expression tracer that emits the exact steps and a controller responder DSL that injects handlers at compile time — but they bite: macros run in the caller or compile context so use macro blocks evaluate early, hygiene can capture caller variables and break assumptions, testing requires spawning or recontextualizing code, and traversal helpers like Macro.walk and Macro.expand are indispensable for building working, debuggable macros.
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chapters (8)
- 0:00Introduction to macros
- 2:52Why use macros
- 5:05Understanding the AST
- 7:12Building and inspecting macros
- 12:42Macro hygiene and context
- 16:11Advanced usage and patterns
- 19:23Testing macro code
- 21:46Best practices and conclusion
