Ruby - Iterating upto and downto
Introduction
To count from a specific low value up to a high value, you may use the upto() method of an integer.
A block argument may optionally be used if you want to display the value at each iteration:
Demo
0.upto(10) do
| i | # w w w . j a va 2 s .com
puts( i )
end
Result
The previous code displays the integers 0 to 10.
To count down from a high to a low value using the downto() method:
Demo
10.downto(0) do
| i | # from w w w .ja v a 2s. c om
puts( i )
end
Result
