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foreach.rb

This Ruby code snippet demonstrates nested file reading to compare each line of foreach_b.txt with every line in foreach_a.txt. It prints “MATCHED: [line1]” if a match is found, and exits the inner loop. The break statement ensures that only the first match for each line in foreach_b.txt is printed. The #=> nil indicates that no further output occurred after the initial matches were found, essentially meaning the loops completed without any additional matches being reported.

Ruby code snippet

File.foreach('input/file/foreach_b.txt') do |line1|
  File.foreach('input/file/foreach_a.txt') do |line2|
      if line1.eql?(line2)
          puts("MATCHED: #{line1}")
          break
      end
  end
end
MATCHED: 9
MATCHED: 2
MATCHED: 6
#=> nil

Executed with Ruby 3.4.5.