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-module(lookup).
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-export([by_key/2]).
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by_key(_, []) -> "unknown";
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by_key(Key, [{Key, Val} | _]) -> Val;
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by_key(Key, [_ | Tail]) -> by_key(Key, Tail).
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% lookup:by_key(birthday, [{ice, "cream"}, {birthday, "cake"}]).
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% equivalent to proplists:get_value/2_
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