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foreach.rb

This Ruby code snippet demonstrates nested file iteration to find matching lines between two files (‘foreach_a.txt’ and ‘foreach_b.txt’). It iterates through each line of ‘foreach_b.txt’, and for each line, it iterates through ‘foreach_a.txt’. If a line matches between the two files, it prints “MATCHED” along with the matching line and breaks the inner loop, effectively finding the first match for each line in ‘foreach_b.txt’. The output shows three matching lines (“9”, “2”, and “6”) were found. The final nil is the implicit return value of the outer loop after completion.

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.