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Description

Lazy (Non-Standard) Evaluation.

An alternative approach to non-standard evaluation using formulas. Provides a full implementation of LISP style 'quasiquotation', making it easier to generate code with other code.

lazyeval

Build Status Coverage Status

The lazyeval package provides tools that make it easier to correctly implement non-standard evaluation (NSE) in R. You use lazy evaluation by requiring the user to "quote" specially evaluated arguments with ~, and then using the lazyeval package to compute with those formulas. It is also possible to eliminate the use of the ~ by converting promises to formulas. This does make programming with such functions a little harder, but it can be worth it in certain situations. See vignette("lazyeval") for more details.

Installation

Install the released version from CRAN with:

install.packages("lazyeval")

Install the development version from github with:

# install.packages("devtools")
devtools::install_github("hadley/lazyeval", build_vignettes = TRUE)
Metadata

Version

0.2.2

License

Unknown

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