rlang: is_lang – R documentation

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rlang

is_lang

Is object a call?

Description

Deprecated lifecycle

These functions are deprecated, please use is_call() and its n argument instead.

Usage

is_lang(x, name = NULL, n = NULL, ns = NULL)

is_unary_lang(x, name = NULL, ns = NULL)

is_binary_lang(x, name = NULL, ns = NULL)

quo_is_lang(quo)

Arguments

`x`	An object to test. If a formula, the right-hand side is extracted.
`name`	An optional name that the call should match. It is passed to `sym()` before matching. This argument is vectorised and you can supply a vector of names to match. In this case, `is_call()` returns `TRUE` if at least one name matches.
`n`	An optional number of arguments that the call should match.
`ns`	The namespace of the call. If `NULL`, the namespace doesn't participate in the pattern-matching. If an empty string `""` and `x` is a namespaced call, `is_call()` returns `FALSE`. If any other string, `is_call()` checks that `x` is namespaced within `ns`. Can be a character vector of namespaces, in which case the call has to match at least one of them, otherwise `is_call()` returns `FALSE`.
`quo`	A quosure to test.

rlang

Functions for Base Types and Core R and 'Tidyverse' Features

v0.4.11

MIT + file LICENSE

Authors

Lionel Henry [aut, cre], Hadley Wickham [aut], mikefc [cph] (Hash implementation based on Mike's xxhashlite), Yann Collet [cph] (Author of the embedded xxHash library), RStudio [cph]

Initial release

is_lang

Description

Usage

Arguments

rlang

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