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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.packages("lazyeval")Install the development version from github with:
# install.packages("devtools")
devtools::install_github("hadley/lazyeval", build_vignettes = TRUE)These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.