Ruby/Statement/until

# Compare the following statements. The first is a while loop:
weight = 150
while weight < 200 do
  puts "Weight: " + weight.to_s
  weight += 5
end
# Here is the same logic expressed with until:
weight = 150
until weight == 200 do
  puts "Weight: " + weight.to_s
  weight += 5
end

until condition [ do | : ]
  code
end

weight = 150
begin
  puts "Weight: " + weight.to_s
  weight += 5
end until weight == 200

An unless statement is really like a negated if statement
if lang == "de"
  dog = "Hund"
else
  dog = "dog"
end
# Now I"ll translate it into unless:
unless lang == "de"
  dog = "dog"
else
  dog = "Hund"
end

until($_ == "q")
puts "Running..."
print "Enter q to quit: "
gets
chomp
end

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