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foreach.rb

This Ruby code snippet demonstrates the use of two nested File.foreach() loops to read lines from two files and compare them. The first loop reads lines from one file, and the second loop reads lines from another file. If a line from the first file is equal to a line from the second file, the program prints “MATCHED: #{line1}”. The break statement is used to exit the inner loop once a match is found.

Note that this code assumes that both files have the same number of lines and that the lines are in the same order in each file. If the files have different numbers of lines or if the lines are not in the same order, the program will produce incorrect results. To ensure correct results, it is recommended to use a library such as fileutils or readlines to read the files and compare them line by line.

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 3.4.4.