Ruby: How to call function before it is defined?

Question

In my seeds.rb file I would like to have the following structure:

# begin of variables initialization
groups = ...
# end of variables initializa         


        

Answer 1

You could use END (upper case, not lower case)

END {
  # begin of variables initialization
  groups = ...
  # end of variables initialization
  check_data
  save_data_in_database
}

but that'd be a bit of a hack.

Basically, END code is run after all other code is run.

Edit: There's also Kernel#at_exit, (rdoc link)