Google Foobar is a secret programming challenge for Python and Java developers. Google sends a challenge to skilled Python and Java developers that might be useful to their organisation!
Type arraylist java in Google Chrome and search it at least 20 times. You might get an invitation.
(Foobar is invitation only!)
If you manage to access Foobar these python scripts can be used to solve some of the challenges. The challenges can be solved in Java or Python (I prefer Python). Make sure your code is a function that can be run by a filerunner.py.
To be fair level 1 is quite easy considering it only requires knowledge on arrays or dictionaries. The challenges can vary from person to person since Google doesn't want to make foobar too easy to complete. There are other rescources that may help online, but Google Foobar's final levels are thought to be quite challenging.
Use this referral link to access foobar directly Foobar With Google