rlang (version 0.0.0.9000)

env_get: Get an object from an environment.

Description

env_get() extracts an object from an enviroment env. By default, it does not look in the parent environments.

Usage

env_get(env = caller_env(), nm, inherit = FALSE)

Arguments

env

An environment or an object with a S3 method for env(). If missing, the environment of the current evaluation frame is returned.

nm

The name of a binding.

inherit

Whether to look for bindings in the parent environments.

Value

An object if it exists. Otherwise, throws an error.

Examples

parent <- new_env(empty_env(), list(foo = "foo"))
env <- new_env(parent, list(bar = "bar"))

# This throws an error because `foo` is not directly defined in env:
# env_get(env, "foo")

# However `foo` can be fetched in the parent environment:
env_get(env, "foo", inherit = TRUE)