metaprogramming

What problem does it solve?

This Skill helps developers write and manipulate R code at the level of expressions, enabling programmatic generation, transformation, and injection of code using rlang's defuse/inject patterns.

Core Features & Use Cases

• Defuse and reassemble expressions with expr(), enquo(), and enquos() to inspect and modify code.
• Build quosures and manage environments for correct evaluation across packages and data masks.
• Inject transformed expressions back into data-masked calls with operators like !! and {{ for forwarding arguments.
• Use cases include generating dynamic function calls in packages, creating meta-programming utilities, and teaching concepts of tidy evaluation.

Quick Start

Use the metaprogramming skill to understand how to defuse an expression, wrap it in a quosure, and inject it into a data-masked context.