Почему так выходит c each на ruby?

hash = Hash.new
%w(cat dog wombat).each_with_index {|item, index|
  hash[item] = index
}
hash   #=> {"cat"=>0, "dog"=>1, "wombat"=>2}

@uuid = {}
found_small = found_page.search('small').each_with_index do | id, i |
  @uuid.merge!( i => id)
end
puts @uuid

a = found_page.search('small')
Hash[*(0...a.size).zip(a).flatten]