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rlang

Overview

The rlang package provides tools to work with core language features of R and the tidyverse:

Tidy evaluation.
Base types: vectors, expressions, and environments.
Call and context stacks.
The condition system.

Installation

rlang is not automatically installed with the tidyverse package, but you can install it with:

install.packages("rlang")
library("rlang")

Or install the development version from github with:

# install.packages("devtools")
devtools::install_github("tidyverse/rlang", build_vignettes = TRUE)

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Version

Install

install.packages('rlang')

Monthly Downloads

1,917,895

Version

0.1

License

GPL-3

Issues

Pull Requests

Stars

Forks

Repository

https://github.com/tidyverse/rlang

Maintainer

Last Published

January 18th, 2025

Functions in rlang (0.1)

Coerce to an environment

Convert to function or closure

Match an argument to a character vector

Coerce to a raw vector

Create a dynamic scope for tidy evaluation

Coerce to pairlist

Signal an error, warning, or message

Test for missing values

How many arguments are currently forwarded in dots?

Evaluate dots with preliminary splicing

Create a dictionary

Extract dots with splicing semantics

Overscope bindings by defining symbols deeper in a scope

Clone an environment

Depth of an environment chain

Get an object from an environment

Evaluate an expression tidily

Tidy evaluation in a custom environment

Create an exiting or in place handler

Raw quotation of an expression

Get or set the environment of an object

How long is an object?

Is object an environment?

Duplicate an R object

Get the empty environment

Create a new environment

Bind symbols to objects in an environment

Get the environment of the caller frame

Signal a condition

Does an environment have or see bindings?

Does environment inherit from another environment?

Does an object have an element with this name?

Invoke a function with a list of arguments

Is an object callable?

Is object a condition?

Remove bindings from an environment

Evaluate an expression in an environment

Turn RHS of formula into a string or label

Flatten or squash a list of lists into a simpler vector

Is object a formula?

Is object a frame?

Is an object an expression?

Is object named?

Is object a node or pairlist?

Modify the arguments of a call

Extract function name of a call

Replace missing values

op-null-default

Default value for NULL

Process unquote operators in a captured expression

Turn an expression to a label

Return the closure environment of a function

Extract arguments from a call

Extract function from a call

Return the head or tail of a call object

Definition operator

Coerce object to quosure

as_utf8_character

Coerce to a character vector and attempt encoding conversion

bare-type-predicates

Bare type predicates

Is an object a quosure or quosure-like?

Is object a stack?

mut_utf8_locale

Set the locale's codeset for testing

Get names of a vector

Names of symbols bound in an environment

Get parent environments

exprs_auto_name

Ensure that list of expressions are all named

Get or set formula components

Find the position or distance of a frame on the evaluation stack

Format a type for error messages

Create a condition object

Create a formula

dots_definitions

Tidy quotation of multiple expressions and dots

Quasiquotation of an expression

Is a quosure quoting a symbolic, missing or NULL object?

scalar-type-predicates

Scalar type predicates

Scoped environments

Create a restarting handler

set_chr_encoding

Set encoding of a string or character vector

Is object a function?

Is a package installed in the library?

Is a vector integer-like?

Is object a call?

Extract arguments from a function

Is an object copyable?

Is object an empty vector or NULL?

Is object a symbol?

Set and get an expression

Data pronoun for tidy evaluation

type-predicates

Type predicates

Generate or handle a missing argument

Modify a vector

Create a function

Infix attribute accessor

Prepend a vector

Name of a primitive function

Base type of an object

Create vectors matching the length of a given vector

Create vectors matching a given length

Evaluate an expression within a given environment

Increasing sequence of integers in an interval

Add attributes to an object

Dispatch on base types

Create a symbol or list of symbols

Get the namespace of a package

Splice a quosure and format it into string or label

Create quosures

Restarts utilities

Jump to a muffling restart

Create a string

Dispatch on call type

vector-coercion

Coerce an object to a base type

vector-construction

Is object identical to TRUE or FALSE?

lang_standardise

Standardise a call

Helpers for pairlist and language nodes

Jump to or from a frame

Jump to the abort restart

Set names of a vector

Splice a list within a vector

Call stack information

Trim top call layers from the evaluation stack

Establish handlers on the stack

Establish a restart point on the stack