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

One way:

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

Answer 2

Try this:

25.downto(0) { |i| puts i }

Answer 3

Print reverse array elements:

nummarray = [3,4,7,3,6,8]

(numarray.length-1).downto(0){ |i| print numarray[i] }

Answer 4

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 5

downto is fine, but there is also the more generic step.

25.step(0, -1){|i| puts i}

Answer 6

Just in case you are working with a range already:

rng = 0..6
rng.reverse_each { |i| p i }

EDIT - more succinctly:

puts(rng.to_a.reverse)