proplists:delete/2

删除列表里所有跟键相关联的元素

用法：

delete(Key, List) -> List

内部实现：

-spec delete(Key, List) -> List when
      Key :: term(),
      List :: [term()].

delete(Key, [P | Ps]) ->
    if is_atom(P), P =:= Key ->
	    delete(Key, Ps);
       tuple_size(P) >= 1, element(1, P) =:= Key ->
	    delete(Key, Ps);
       true ->
	    [P | delete(Key, Ps)]
    end;
delete(_, []) ->
    [].

删除列表 List 里所有跟键 Key 相关联的元素。

proplists:delete(a, [{a, true}, {b, false}, c, {a, true}, {a, 1}, {a, [2]}]).