Exercise

Do variables exist?

If R cannot find a variable in the current environment, it will look in the parent environment, then the grandparent environment, and so on until it finds it.

rsa_env has been modified so it includes capitals and national_parks, but not population.

Instructions

100 XP

Check if population exists in rsa_env, using default inheritance rules.
Check if population exists in rsa_env, ignoring inheritance.