Created
September 25, 2009 19:25
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# GoKart becomes a module | |
module GoKart | |
# GoKart.new becomes a factory method for strategy classes | |
def self.new( strategy = nil ) | |
( strategy == :reverse ) ? ReverseStrategy.new : ForwardStrategy.new | |
end | |
class ForwardStrategy | |
def drive | |
puts "Forward" | |
end | |
def stop | |
puts "Stop" | |
end | |
end | |
class ReverseStrategy < ForwardStrategy | |
def drive | |
puts "Reverse" | |
end | |
end | |
end | |
# No interface change for consumer: | |
k = GoKart.new | |
k.drive | |
k.stop | |
k = GoKart.new( :reverse ) | |
k.drive | |
k.stop | |
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