is_pairlist

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Is object a node or pairlist?

  • is_pairlist() checks that x has type pairlist.

  • is_node() checks that x has type pairlist or language. It tests whether x is a node that has a CAR and a CDR, including callable nodes (language objects).

  • is_node_list() checks that x has type pairlist or NULL. NULL is the empty node list.

Keywords
internal
Usage
is_pairlist(x)

is_node(x)

is_node_list(x)

Arguments
x

Object to test.

Life cycle

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

See Also

is_call() tests for language nodes.

Aliases
  • is_pairlist
  • is_node
  • is_node_list
Documentation reproduced from package rlang, version 0.2.0, License: GPL-3

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