How to change a lightbulb in Ruby
if !light # Try and switch the light on. light_switch.flick end # Still no light? if !light # Is there an old lightbuld in the socket? if old_lightbulb.installed? old_lightbulb.remove.discard! :bin end # Try and find a new lightbulb. new_lightbulb = Lightbulb.find_by_torchlight, :locations => [:kitchen, :bathroom, :under_stairs] if new_lightbulb begin new_lightbulb.install rescue BurntFingers swear :lots # Switch the light OFF light_switch.flick retry end # Switch the light on. light_switch.flick else raise NoNewLightBulbsInTheHouseError.new "Go to the shops." end end
Download this code: lightbulb.rb