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Design Pattern: Builder and Car
class ElectronicCarBuilder
def build
car = ''
# 1. build car frame
car << "This is an electronic car\n"
# 2. add an engine
car << " with a electronic engine\n"
# 3. add front wheels
car << " with two front wheels\n"
# 4. add back wheels
car << " with two back wheels\n"
# 5. add dashboard
car << " with a dashboard showing current battery level\n"
# 6. add a energy source
car << " with a battery\n"
# return the car
car
end
end
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