With nested for loops, you can easily print out times tables from 1 to 12:


for i in 1..12
  for j in 1..12
    print i.to_s + " x " + j.to_s + " = ", j * i, "\n"
  end
end

1.	The for loop
2.	a for loop and an inclusive string range
3.	Drop the do. It isn't required, but you have to keep end:
4.	If you want to do the for loop on one line, you have to throw in the do
5.	An example of a for loop that prints out a times table (from 1 to 12) for the number 2

With nested for loops, you can easily print out times tables from 1 to 12: : with for « Range « Ruby