is_lang

<a href="https://lifecycle.r-lib.org/articles/stages.html#deprecated"><img src="figures/lifecycle-deprecated.svg?package=rlang&version=1.1.3" alt="[Deprecated]"></a>
These functions are deprecated, please use <code>is_call()</code> and its <code>n</code>
argument instead.

internal

A toolbox for working with base types, core R features
like the condition system, and core 'Tidyverse' features like tidy
evaluation.

Lionel Henry

rlang

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

Hadley Wickham

mikefc 

Yann Collet

Posit, PBC 

is_lang function

<dl><dt>x</dt>
<dd>An object to test. Formulas and quosures are treated
literally.</dd>
<dt>name</dt>
<dd>An optional name that the call should match. It is
passed to <code>sym()</code> before matching. This argument is vectorised
and you can supply a vector of names to match. In this case,
<code>is_call()</code> returns <code>TRUE</code> if at least one name matches.</dd>
<dt>n</dt>
<dd>An optional number of arguments that the call should
match.</dd>
<dt>ns</dt>
<dd>The namespace of the call. If <code>NULL</code>, the namespace
doesn't participate in the pattern-matching. If an empty string
<code>""</code> and <code>x</code> is a namespaced call, <code>is_call()</code> returns
<code>FALSE</code>. If any other string, <code>is_call()</code> checks that <code>x</code> is
namespaced within <code>ns</code>.
Can be a character vector of namespaces, in which case the call
has to match at least one of them, otherwise <code>is_call()</code> returns
<code>FALSE</code>.</dd></dl>

Arguments

<a href='https://lifecycle.r-lib.org/articles/stages.html#deprecated'><img src='figures/lifecycle-deprecated.svg' alt='[Deprecated]' /></a>
These functions are deprecated, please use <code>is_call()</code> and its <code>n</code>
argument instead.

Is object a call? — is_lang

<dl>

<dt>x</dt>
<dd>An object to test. Formulas and quosures are treated
literally.</dd>


<dt>name</dt>
<dd>An optional name that the call should match. It is
passed to <code>sym()</code> before matching. This argument is vectorised
and you can supply a vector of names to match. In this case,
<code>is_call()</code> returns <code>TRUE</code> if at least one name matches.</dd>


<dt>n</dt>
<dd>An optional number of arguments that the call should
match.</dd>


<dt>ns</dt>
<dd>The namespace of the call. If <code>NULL</code>, the namespace
doesn't participate in the pattern-matching. If an empty string
<code>""</code> and <code>x</code> is a namespaced call, <code>is_call()</code> returns
<code>FALSE</code>. If any other string, <code>is_call()</code> checks that <code>x</code> is
namespaced within <code>ns</code>.
Can be a character vector of namespaces, in which case the call
has to match at least one of them, otherwise <code>is_call()</code> returns
<code>FALSE</code>.</dd>

</dl>

is_lang: Is object a call?

Description

Usage

Arguments