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Is object a node or pairlist?

Source: R/node.R
is_pairlist.Rd

  • 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.

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.