35 lines
1,021 B
Elixir
35 lines
1,021 B
Elixir
defmodule SpaceAge do
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@type planet :: :mercury | :venus | :earth | :mars | :jupiter
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| :saturn | :uranus | :neptune
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@doc """
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Return the number of years a person that has lived for 'seconds' seconds is
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aged on 'planet'.
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"""
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@spec age_on(planet, pos_integer) :: float
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def age_on(planet, seconds) do
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cond do
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planet == :mercury ->
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earth_age(seconds) / 0.2408467
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planet == :venus ->
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earth_age(seconds) / 0.61519726
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planet == :earth ->
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earth_age(seconds)
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planet == :mars ->
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earth_age(seconds) / 1.8808158
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planet == :jupiter ->
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earth_age(seconds) / 11.862615
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planet == :saturn ->
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earth_age(seconds) / 29.447498
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planet == :uranus ->
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earth_age(seconds) / 84.016846
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planet == :neptune ->
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earth_age(seconds) / 164.79132
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end
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end
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def earth_age(seconds) do
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seconds / 31557600
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end
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end
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