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  1. def filter(list, params)
  2.   result = []
  3.   list.each do |element|
  4.     case params
  5.       when :aho
  6.         if element.include?('3') || element.to_i.modulo(3) == 0
  7.           result << element
  8.         end
  9.       when :even
  10.         if element.to_i.even?
  11.           result << element
  12.         end
  13.       when :odd
  14.         if element.to_i.odd?
  15.           result << element
  16.         end
  17.       else
  18.         result << element
  19.     end
  20.   end
  21.   result
  22. end
  23.  
  24. def show_html(list)
  25.   puts '<html>'
  26.   puts '  <ul>'
  27.   list.each do |element|
  28.     puts "    <ui>#{element}</ui>"
  29.   end
  30.   puts '  </ul>'
  31.   puts '</html>'
  32. end
  33.  
  34. #### :even #####
  35. list = %w(18 22 11 73 91 38 24 17)
  36.  
  37. filtered_list = filter(list, :even) 
  38. show_html(filtered_list)
Success #stdin #stdout 0s 8200KB
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Standard input is empty
stdout
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<html>
  <ul>
    <ui>18</ui>
    <ui>22</ui>
    <ui>38</ui>
    <ui>24</ui>
  </ul>
</html>
https://ideone.com/IMvDjE
イテレーターパターン code6
language:
Ruby (ruby 2.5.5)
created:
7 years ago
visibility:
secret

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