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Adzz/adding_a_shape.ex

Last active May 29, 2018 22:24
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adding_a_shape.ex
defmodule Circle do
defstruct [:radius]
end
defimpl AreaProtocol, for: Circle do
def calculate(%Circle{radius: radius}) do
3.14 * radius * radius
end
end
Shape.calculate(%Area{}, %Circle{radius: 2})
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