Really?? I don'r understand nothing for entire lesson...
what don't you understand about it?
the site uses your functions to test it's own code.
that's why sometimes you dont need to declare or even call some functions.
for example, it might be calling
double_list([4,8,10]) to test YOUR function
Hi @thingsofyourmind I don´t understand from where the function is taking the values in the arguments.
They are hidden, depending on the exercise, the site tests your function multiple times, with its own input