| env_cache {rlang} | R Documentation |
env_cache() is a wrapper around env_get() and env_poke()
designed to retrieve a cached value from env.
If the nm binding exists, it returns its value.
Otherwise, it stores the default value in env and returns that.
env_cache(env, nm, default)
env |
An environment. |
nm |
Names of bindings. |
default |
The default value to store in |
Either the value of nm or default if it did not exist
yet.
e <- env(a = "foo") # Returns existing binding env_cache(e, "a", "default") # Creates a `b` binding and returns its default value env_cache(e, "b", "default") # Now `b` is defined e$b