globals/toplevel_binding/live_locals_parens.rb

tests/_examples/globals/toplevel_binding/live_locals_parens.rb in the metorex repository.

# TOPLEVEL_BINDING stands over the script's own top level: a name assigned
# there is reserved from the start and reads back as it is set.
p TOPLEVEL_BINDING.local_variable_get(:counter)
counter = 1
p TOPLEVEL_BINDING.local_variable_get(:counter)
counter = 2
p TOPLEVEL_BINDING.local_variable_get(:counter)
p TOPLEVEL_BINDING.local_variables.sort

# A name set through the binding joins the ones the script wrote.
TOPLEVEL_BINDING.local_variable_set(:through_the_binding, 3)
p TOPLEVEL_BINDING.local_variables.sort

Output:

nil
1
2
[:counter]
[:counter, :through_the_binding]