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rlang
Overview
The rlang package provides tools to work with core language features
of R and the tidyverse:
The tidyeval framework, which is a well-founded system for non-standard
evaluation built on quasiquotation (UQ()) and quosures (quo()).
Read more in vignette("tidy-evaluation").
Consistent tools for working with base types:
Vectors, including construction (lgl(), int(), ...)
coercion (as_logical(), as_character(), ...), and
predicates (is_logical(), is_character()).
Language objects, such as calls (lang()) and symbols (sym()).
Attributes, e.g. set_attrs(), set_names().
Functions, e.g. new_function(), as_function(), is_function().
Environments, e.g. env(), env_has(), env_get(), env_bind(),
env_unbind().
A comprehensive set of predicates to determine if an object satisfies
various conditions, e.g. has_length(), is_list(), is_empty().
The condition (message, warning, error) and restart system.
Call and context stacks.
Installation
You can install the released version of rlang from CRAN with:
install.packages("rlang")
Or install the development version from github with: