How does a quosure differ from a standard expression?

A quosure is a special object that bundles an expression with the environment where it was created, ensuring that symbols resolve correctly even when evaluated in a different scope.

When should I use the embrace {{ operator?

The embrace operator should be used when you want to forward a function argument directly into a data-masked context, such as inside a dplyr::mutate() or summarise() call.

What is R metaprogramming with rlang?

It is a framework for treating R code as data, allowing developers to capture, modify, and evaluate expressions programmatically while maintaining environment context.

Can this skill help convert strings to column names?

Yes, it provides patterns for using sym() and syms() to convert character strings into symbols that R can evaluate as variable names.

Does this skill cover tidy evaluation patterns?

This skill focuses on the underlying metaprogramming mechanics (defuse/inject). Specific data-masking patterns are covered in the related tidy-evaluation skill.

R Metaprogramming with rlang

Name: R Metaprogramming with rlang
Author: jsperger

byjsperger

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Data Science & ML

Manipulates R expressions and builds dynamic code using rlang's defuse and inject mechanics.

About

The metaprogramming skill empowers Claude to master R's unique ability to treat code as data, facilitating the programmatic construction and transformation of expressions. By leveraging the rlang framework, this skill enables the correct application of defusing patterns like enquo() and expression injection via the bang-bang (!!) and embrace ({{) operators. It is essential for developers building robust, flexible R functions that require environment tracking through quosures or dynamic symbol construction, ensuring that code remains predictable and maintainable across different scopes.

Key Features

Inject and splice code into new contexts with !!, !!!, and {{ operators
Construct dynamic symbols and variable names using sym() and data_sym()
1 GitHub stars
Defuse expressions and user arguments using expr(), enquo(), and enquos()
Manage quosure environments to prevent symbol resolution errors across packages
Interpolate names in dynamic dots using glue-style syntax and englue()

Use Cases

Developing custom wrapper functions for tidyverse libraries like dplyr and ggplot2
Debugging complex environment and scoping issues in package development
Building dynamic R pipelines that generate code based on external configuration or metadata

About

Key Features

Inject and splice code into new contexts with !!, !!!, and {{ operators
Construct dynamic symbols and variable names using sym() and data_sym()
1 GitHub stars
Defuse expressions and user arguments using expr(), enquo(), and enquos()
Manage quosure environments to prevent symbol resolution errors across packages
Interpolate names in dynamic dots using glue-style syntax and englue()

Use Cases

Developing custom wrapper functions for tidyverse libraries like dplyr and ggplot2
Debugging complex environment and scoping issues in package development
Building dynamic R pipelines that generate code based on external configuration or metadata