is_pairlist

is_node

is_node_list

<ul>
<li><code>is_pairlist()</code> checks that <code>x</code> has type <code>pairlist</code>.</li>
<li><code>is_node()</code> checks that <code>x</code> has type <code>pairlist</code> or <code>language</code>.
It tests whether <code>x</code> is a node that has a CAR and a CDR,
including callable nodes (language objects).</li>
<li><code>is_node_list()</code> checks that <code>x</code> has type <code>pairlist</code> or <code>NULL</code>.
<code>NULL</code> is the empty node list.</li>
</ul>

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_pairlist function

<dl><dt>x</dt>
<dd>Object to test.</dd></dl>

Arguments

These functions are experimental. We are still figuring out a good
naming convention to refer to the different lisp-like lists in R.

Life cycle

Is object a node or pairlist? — is_pairlist

<dl>

<dt>x</dt>
<dd>Object to test.</dd>

</dl>

These functions are experimental. We are still figuring out a good
naming convention to refer to the different lisp-like lists in R.

is_pairlist: Is object a node or pairlist?

Description

Usage

Arguments

Life cycle

See Also