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https://github.com/rjNemo/exercism-elixir
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40 lines
1.4 KiB
Elixir
40 lines
1.4 KiB
Elixir
defmodule SpaceAge do
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@type planet ::
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:mercury
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| :venus
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| :earth
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| :mars
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| :jupiter
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| :saturn
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| :uranus
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| :neptune
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@seconds_in_earth_year 31_557_600
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@seconds_in_mercury_year 0.2408467 * @seconds_in_earth_year
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@seconds_in_venus_year 0.61519726 * @seconds_in_earth_year
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@seconds_in_mars_year 1.8808158 * @seconds_in_earth_year
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@seconds_in_jupiter_year 11.862615 * @seconds_in_earth_year
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@seconds_in_saturn_year 29.447498 * @seconds_in_earth_year
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@seconds_in_uranus_year 84.016846 * @seconds_in_earth_year
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@seconds_in_neptune_year 164.79132 * @seconds_in_earth_year
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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', or an error if 'planet' is not a planet.
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"""
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@spec age_on(planet, pos_integer) :: {:ok, float} | {:error, String.t()}
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def age_on(planet, seconds) do
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case planet do
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:mercury -> {:ok, seconds / @seconds_in_mercury_year}
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:venus -> {:ok, seconds / @seconds_in_venus_year}
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:earth -> {:ok, seconds / @seconds_in_earth_year}
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:mars -> {:ok, seconds / @seconds_in_mars_year}
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:jupiter -> {:ok, seconds / @seconds_in_jupiter_year}
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:saturn -> {:ok, seconds / @seconds_in_saturn_year}
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:uranus -> {:ok, seconds / @seconds_in_uranus_year}
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:neptune -> {:ok, seconds / @seconds_in_neptune_year}
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# sorry pluto
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_ -> {:error, "not a planet"}
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end
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end
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end
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