assert_all_are_existing

assert_any_are_existing

is_existing

Does the variable exist?
 
See <code><a href="/link/is_existing?package=assertive&version=0.3-2&to=assertive.code" rd-options="assertive.code" data-mini-rdoc="assertive.code::is_existing">is_existing</a></code>.

Lots of predicates (is_* functions) to check the state of your
    variables, and assertions (assert_* functions) to throw errors if they
    aren't in the right form.

is_existing: Does the variable exist? See `is_existing`.

Description

Arguments