until loops until a certain condition is met

x = 1
until x > 99
  puts x
  x = x * 2
end

1.	Here's the formal specification for the until loop:
2.	until keeps looping while its condition remains false, or not true.
3.	As unless is a negated form of if, until is really a negated form of while.
4.	like while, you have another form you can use with untila€¡±that is, with begin/end:
5.	unless and until

until loops until a certain condition is met : until « Statement « Ruby