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).
Arguments
- env
An environment.
- nms
A character vector of binding names for which to check
existence.
- inherit
Whether to look for bindings in the parent
environments.
Value
A named logical vector as long as nms.
Examples
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")
#> foo
#> FALSE
env_has(env, "foo", inherit = TRUE)
#> foo
#> TRUE
