if / elsif / else. unless is inverted if.

Goal

Label a kiosk busy or quiet.

units = 12
if units >= 10
  puts "busy"
else
  puts "quiet"
end

city = "Mombasa"
if city == "Nairobi"
  puts "capital"
elsif city == "Mombasa"
  puts "coast"
else
  puts "other"
end

units = 5
puts units >= 10 ? "busy" : "quiet"

n = 0
unless n > 0
  puts "empty till"
end