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  1. class CharCountFilter
  2.   TARGET_COUNT = 2
  3.  
  4.   def self.filter(lines)
  5.     lines.select { |line| char_appears_exactly_twice?(line) }
  6.   end
  7.  
  8.   def self.char_appears_exactly_twice?(line)
  9.     count_characters(line).value?(TARGET_COUNT)
  10.   end
  11.  
  12.   def self.count_characters(line)
  13.     line.chars.each_with_object(Hash.new(0)) { |char, counts| counts[char] += 1 }
  14.   end
  15. end
  16.  
  17. lines = ARGF.readlines.map(&:chomp)
  18.  
  19. puts CharCountFilter.filter(lines)
Success #stdin #stdout 0.01s 8032KB
comments (?)
stdin
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asdf
fdas
asds
d fm
dfaa
aaaa
aabb
aaabb
stdout
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asds
dfaa
aabb
aaabb
https://ideone.com/cUs3nl
language:
Ruby (ruby 2.5.5)
created:
1 day ago
visibility:
public

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