search by key from flat list

search_key_from_flat_list.ex

def search(key, list) do
  list
  |> Enum.split(2) # convert list to key/value
  |> Tuple.to_list
  |> Enum.filter_map(fn(v) -> v |> List.first == key end, &(&1 |> List.last))
  |> List.first
end

search("hoge", ["hoge", 1, "fuga", 2, "piyo", "baz"]) # 1