#no need to create array first

myStr = String.new('1,2,3\n4,5,6\n7,8,9')
puts "The data:\n#{myStr}\n"
nocom = myStr.gsub(/,/,'') 
puts "Commas are gone as follows: #{nocom}"
arr = nocom.split(/\\n/)
puts arr

The data:
1,2,3\n4,5,6\n7,8,9
Commas are gone as follows: 123\n456\n789
123
456
789