rlang (version 1.1.0)

zap: Create zap objects

Description

zap() creates a sentinel object that indicates that an object should be removed. For instance, named zaps instruct env_bind() and call_modify() to remove those objects from the environment or the call.

The advantage of zap objects is that they unambiguously signal the intent of removing an object. Sentinels like NULL or missing_arg() are ambiguous because they represent valid R objects.

Usage

zap()
is_zap(x)

Arguments

x

An object to test.

Examples

# Create one zap object:
zap()

# Create a list of zaps:
rep(list(zap()), 3)
rep_named(c("foo", "bar"), list(zap()))