How to write negative loop in ruby like for(i=index; i >= 0; i --)

Question

How can I write a loop in Ruby that counts down, similar to the following C-style for loop?

for (i = 25; i >= 0; i--) {      print i; } 

Answer 1

There are many ways to perform a decrementing loop in Ruby:

First way:

for i in (10).downto(0)   puts i end 

Second way:

(10).downto(0) do |i|   puts i end 

Third way:

i=10; until i<0   puts i   i-=1 end 

Answer 2

One way:

25.downto(0) do |i|   puts i end