Where did the zeros come from?

Question

ruby

there is this code:

require 'nokogiri'
require 'open-uri'

url = "http://ruby-doc.org/core-2.3.1/"

data = Nokogiri::HTML(open(url))
class_url = []
doc = data.css('#class-index .entries p a').each do |d|
  class_url <<  "#{url}#{d.attribute("href")}"
end

class_url.each do |u|
  data = Nokogiri::HTML(open(u))
  #puts data.at_css("h1.class, h1.module").text
  methods = data.css("#method-list-section ul li a")
  puts methods.each {|n| puts "    #{n.text}"}
end

do zeros appear in the output as separators between pages, and zeros without indents? those. not from the methods loop. Where did they come from and what gives them away?

spoiler

::[]
    ::new
    ::try_convert
    #&
    #*
    #+
    #-
    #
    #
    #==
    #[]
    #[]=
    #any?
    #assoc
    #at
    #bsearch
    #bsearch_index
    #clear
    #collect
    #collect!
    #combination
    #compact
    #compact!
    #concat
    #count
    #cycle
    #delete
    #delete_at
    #delete_if
    #dig
    #drop
    #drop_while
    #each
    #each_index
    #empty?
    #eql?
    #fetch
    #fill
    #find_index
    #first
    #flatten
    #flatten!
    #frozen?
    #hash
    #include?
    #index
    #initialize_copy
    #insert
    #inspect
    #join
    #keep_if
    #last
    #length
    #map
    #map!
    #pack
    #permutation
    #pop
    #product
    #push
    #rassoc
    #reject
    #reject!
    #repeated_combination
    #repeated_permutation
    #replace
    #reverse
    #reverse!
    #reverse_each
    #rindex
    #rotate
    #rotate!
    #sample
    #select
    #select!
    #shift
    #shuffle
    #shuffle!
    #size
    #slice
    #slice!
    #sort
    #sort!
    #sort_by!
    #take
    #take_while
    #to_a
    #to_ary
    #to_h
    #to_s
    #transpose
    #uniq
    #uniq!
    #unshift
    #values_at
    #zip
    #|
0
    #%
    #&
    #*
    #**
    #+
    #-
    #[email protected]
    #/
    #
    #
    #
    #
    #==
    #===
    #>
    #>=
    #>>
    #[]
    #^
    #abs
    #bit_length
    #coerce
    #div
    #divmod
    #eql?
    #even?
    #fdiv
    #hash
    #inspect
    #magnitude
    #modulo
    #odd?
    #remainder
    #size
    #to_f
    #to_s
    #|
    #~
0
    ::new
    #!
    #!=
    #==
    #__id__
    #__send__
    #equal?
    #instance_eval
    #instance_exec
    #method_missing
    #singleton_method_added
    #singleton_method_removed
    #singleton_method_undefined
0
    #!~
    #
    #===
    #=~
    #class
    #clone
    #define_singleton_method
    #display
    #dup
    #enum_for
    #eql?
    #extend
    #freeze
    #frozen?
    #hash
    #inspect
    #instance_of?
    #instance_variable_defined?
    #instance_variable_get
    #instance_variable_set
    #instance_variables
    #is_a?
    #itself
    #kind_of?
    #method
    #methods
    #nil?
    #object_id
    #private_methods
    #protected_methods
    #public_method
    #public_methods
    #public_send
    #remove_instance_variable
    #respond_to?
    #respond_to_missing?
    #send
    #singleton_class
    #singleton_method
    #singleton_methods
    #taint
    #tainted?
    #tap
    #to_enum
    #to_s
    #trust
    #untaint
    #untrust
    #untrusted?
0
    ::constants
    ::nesting
    ::new
    #
    #
    #
    #==
    #===
    #>
    #>=
    #alias_method
    #ancestors
    #append_features
    #attr
    #attr_accessor
    #attr_reader
    #attr_writer
    #autoload
    #autoload?
    #class_eval
    #class_exec
    #class_variable_defined?
    #class_variable_get
    #class_variable_set
    #class_variables
    #const_defined?
    #const_get
    #const_missing
    #const_set
    #constants
    #define_method
    #deprecate_constant
    #extend_object
    #extended
    #freeze
    #include
    #include?
    #included
    #included_modules
    #inspect
    #instance_method
    #instance_methods
    #method_added
    #method_defined?
    #method_removed
    #method_undefined
    #module_eval
    #module_exec
    #module_function
    #name
    #prepend
    #prepend_features
    #prepended
    #private
    #private_class_method
    #private_constant
    #private_instance_methods
    #private_method_defined?
    #protected
    #protected_instance_methods
    #protected_method_defined?
    #public
    #public_class_method
    #public_constant
    #public_instance_method
    #public_instance_methods
    #public_method_defined?
    #refine
    #remove_class_variable
    #remove_const
    #remove_method
    #singleton_class?
    #to_s
    #undef_method
    #using
0
    ::new
    #allocate
    #inherited
    #new
    #superclass
0
    ::polar
    ::rect
    ::rectangular
    #*
    #**
    #+
    #-
    #[email protected]
    #/
    #==
    #abs
    #abs2
    #angle
    #arg
    #conj
    #conjugate
    #denominator
    #fdiv
    #imag
    #imaginary
    #inspect
    #magnitude
    #numerator
    #phase
    #polar
    #quo
    #rationalize
    #real
    #real?
    #rect
    #rectangular
    #to_c
    #to_f
    #to_i
    #to_r
    #to_s
    #~
0

PS if you check like this, then there are no zeros on the page