zap: Create zap objects

In hadley/rlang: Functions for Base Types and Core R and 'Tidyverse' Features

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()))

hadley/rlang documentation built on April 18, 2024, 8:48 p.m.