Placing Ruby `require` outside of a module definition?

Question

In Ruby, is it OK to place a require statement outside of a module definition? Will the require'd module still be available inside classes nested in the module?

For example, is this:

require 'baz'
module Foo
  class Bar
    # some code using Baz
  end
end 

the same as this?

module Foo
  require 'baz'
  class Bar
    # some code using Baz
  end
end 

and the same as this?

module Foo
  class Bar
    require 'baz'
    # some code using Baz
  end
end 

Answer 1

You can put require anywhere. As you can see in the documentation here, constants and globals from the required file are always added the the global namespace. Best practice is generally to use require outside of any nesting, but some gems take advantage of the fact that it available anywhere to conditionally require files based on ruby logic, i.e

if some_boolean
  require 'file'
end