string_count.rb

GC.start
first_count = ObjectSpace.each_object(String) { |x| nil }

def dummy_function
  'foo'
end

second_count = ObjectSpace.each_object(String) { |x| nil }
GC.start
second_after_gc_count = ObjectSpace.each_object(String) { |x| nil }

dummy_function;

third_count = ObjectSpace.each_object(String) { |x| nil }
GC.start
third_after_gc_count = ObjectSpace.each_object(String) { |x| nil }

dummy_function;

fourth_count = ObjectSpace.each_object(String) { |x| nil }
GC.start
fourth_after_gc_count = ObjectSpace.each_object(String) { |x| nil }

puts "#{first_count} #{second_count} #{second_after_gc_count} #{third_count} #{third_after_gc_count} #{fourth_count} #{fourth_after_gc_count}"