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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.


Install the released version from CRAN with:


Install the development version from github with:

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

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lazyeval documentation built on May 29, 2017, 5:29 p.m.