50 lines
1.4 KiB
Elixir
50 lines
1.4 KiB
Elixir
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defmodule WineCellar do
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@colors [
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white: "Fermented without skin contact.",
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red: "Fermented with skin contact using dark-colored grapes.",
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rose: "Fermented with some skin contact, but not enough to qualify as a red wine."
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]
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# @cellar [
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# white: {"Chardonnay", 2015, "Italy"},
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# white: {"Pinot grigio", 2017, "Germany"},
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# red: {"Pinot noir", 2016, "France"},
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# rose: {"Dornfelder", 2018, "Germany"}
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# ]
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def explain_colors(), do: @colors
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def filter(cellar, color, opts \\ []) do
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cellar
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|> Keyword.get_values(color)
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|> filter_by_year(opts[:year])
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|> filter_by_country(opts[:country])
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end
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# The functions below do not need to be modified.
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defp filter_by_year(wines, year)
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defp filter_by_year(wines, nil), do: wines
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defp filter_by_year([], _year), do: []
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defp filter_by_year([{_, year, _} = wine | tail], year) do
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[wine | filter_by_year(tail, year)]
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end
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defp filter_by_year([{_, _, _} | tail], year) do
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filter_by_year(tail, year)
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end
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defp filter_by_country(wines, country)
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defp filter_by_country(wines, nil), do: wines
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defp filter_by_country([], _country), do: []
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defp filter_by_country([{_, _, country} = wine | tail], country) do
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[wine | filter_by_country(tail, country)]
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end
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defp filter_by_country([{_, _, _} | tail], country) do
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filter_by_country(tail, country)
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end
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end
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