/test/loop.rb

 1x = 1
 2while x < 4
 3  puts x
 4  x = x + 1
 5end
 6# => 1
 7# => 2
 8# => 3
 9
10x = 4
11until x < 1
12  puts x
13  x = x - 1
14end
15# => 4
16# => 3
17# => 2
18# => 1