A simple original Ruby code:
class Person # weight in gram and height in centimeter attr_accessor :weight, :height def bmi if weight.nil? or height.nil? 0 else height_in_meter = height * 100 (weight * 1000) / (height_in_meter * height_in_meter) end end endcan be refactored to:
class Person # weight in gram and height in centimeter attr_accessor :weight, :height def bmi return 0 if weight.nil? or height.nil? height_in_meter = height * 100 (weight * 1000) / (height_in_meter * height_in_meter) end endThe improvement by just simply returning the result when it is known is obvious.
Supported by Ruby 2.1.0
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