映射与无关紧要的密钥访问

Question

使用定义为原子或字符串的键在Map上匹配的最佳做法是什么？

%{"artist" => artist, "track" => track, "year" => year}

VS

%{artist: artist, track: track, year: year}

功能需要在两者上匹配：

def duplicate_post(%{"artist" => artist, "track" => track, "year" => year}) do
  ...
end

Answer 1

我能想到的最好方法是两次定义函数，每种输入一次，然后从另一种调用其中一种。

def duplicate_post(%{"artist" => artist, "track" => track, "year" => year}) do
  duplicate_post(%{artist: artist, track: track, year: year})
end

def duplicate_post(%{artist: artist, track: track, year: year}) do
  ...
end

Answer 2

有一个Elixir库可以很好地包装地图，结构，列表和元组，以提供无关紧要的访问：

https://github.com/vic/indifferent

https://hex.pm/packages/indifferent