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

Andrew Grimm mentions END; there's also BEGIN

foo "hello"


BEGIN {
def foo (n)
  puts n
end}

You can't use this to initialize variables because the {} defines a local variable scope.