The Ruby Way: Solutions and Techniques in Ruby Programming, Second Edition

2.5. Processing a Line at a Time

A Ruby string can contain newlines. For example, a file can be read into memory and stored in a single string. The default iterator each processes such a string one line at a time:

str = "Once upon\na time...\nThe End\n"
num = 0
str.each do |line|
  num += 1
  print "Line #{num}: #{line}"
end

The preceding code produces three lines of output:

Line 1: Once upon
Line 2: a time...
Line 3: The End

The method each_with_index could also be used in this case.