rlang (version 0.1)

env_has: Does an environment have or see bindings?

Description

env_has() is a vectorised predicate that queries whether an environment owns bindings personally (with inherit set to FALSE, the default), or sees them in its own environment or in any of its parents (with inherit = TRUE).

Usage

env_has(env = caller_env(), nms, inherit = FALSE)

Arguments

env

An environment or an object bundling an environment, e.g. a formula, quosure or closure.

nms

A character vector containing the names of the bindings to remove.

inherit

Whether to look for bindings in the parent environments.

Value

A logical vector as long as nms.

Examples

# NOT RUN {
parent <- child_env(NULL, foo = "foo")
env <- child_env(parent, bar = "bar")

# env does not own `foo` but sees it in its parent environment:
env_has(env, "foo")
env_has(env, "foo", inherit = TRUE)
# }