Fooling around with Ruby's throw - catch

throw_catch.rb

def detector(jedi)
	case jedi
	when :anakin, :darth_vader
		puts "I find your lack of faith disturbing."
		throw :dark_side, jedi
	when :dooku, :dark_tyranus
		puts "There is a fine line between neutral and amoral. In fact, there may be no line there at all."
		throw :dark_side, jedi
	when :luke
		puts "I'm Luke"
		throw(:light_side, jedi)
	else
		puts "Unable to detect allegiance!"
	end
end

def catched_detector(name)
	catch(:dark_side) do
		puts "This line is always evaluated..."
		catch(:light_side) do
			puts "This line is also always evaluated..."
			detector(name)
			puts "This line is only evaluated when nothing is thrown..."
		end
		puts "This line is only evaluated for the light side and when nothing is thrown..."
	end
end

# [121] pry(main)> catched_detector(:anakin)
# This line is always evaluated...
# This line is also always evaluated...
# I find your lack of faith disturbing.
# => :anakin
# [122] pry(main)> catched_detector(:luke)
# This line is always evaluated...
# This line is also always evaluated...
# I'm Luke
# This line is only evaluated for the light side and when nothing is thrown...
# => nil
# [123] pry(main)> catched_detector(:yoda)
# This line is always evaluated...
# This line is also always evaluated...
# Unable to detect allegiance!
# This line is only evaluated when nothing is thrown...
# This line is only evaluated for the light side and when nothing is thrown...
# => nil