[英]Decode JSON property names to list strings instead of binary strings using Jiffy in Erlang
I have a tuple generated using jiffy library. 我有一个使用jiffy库生成的元组。
For example : jiffy:decode(<<"{\\"foo\\":\\"bar\\"}">>).
例如: jiffy:decode(<<"{\\"foo\\":\\"bar\\"}">>).
results in 结果是
{[{<<"foo">>,<<"bar">>}]}
I want <<"foo">>
to be "foo"
我希望<<"foo">>
成为"foo"
Is there a way for converting the <<"foo">>
to "foo"
? 有没有办法将<<"foo">>
转换为"foo"
?
Basically I want to convert this: 基本上我想转换这个:
[{<<"t">>,<<"getWebPagePreview">>},{<<"message">>,<<"google.com">>}]
into this: 进入这个:
[{"t",<<"getWebPagePreview">>},{"message",<<"google.com">>}]
note: consider this to be a very large list, and I want an efficient solution. 注意:认为这是一个非常大的列表,我想要一个有效的解决方案。
there is a function to transform a binary <<"hello">>
into a list "hello"
: 有一个函数将二进制<<"hello">>
转换为列表"hello"
:
1> binary_to_list(<<"hello">>).
"hello"
2> L = [{<<"t">>,<<"getWebPagePreview">>},{<<"message">>,<<"google.com">>}].
[{<<"t">>,<<"getWebPagePreview">>},
{<<"message">>,<<"google.com">>}]
You can apply this to your list using a list comprehension: 您可以使用列表推导将其应用于列表:
3> [{binary_to_list(X),Y} || {X,Y} <- L].
[{"t",<<"getWebPagePreview">>},{"message",<<"google.com">>}]
4>
you can embed this in a function: 你可以将它嵌入到一个函数中:
convert(List) ->
F = fun({X,Y}) -> {binary_to_list(X),Y} end,
[F(Tuple) || Tuple <- List].
Because (when) order of elements doesn't matter the most efficient version is 因为(当)元素的顺序无关紧要,最有效的版本是
convert({List}) ->
{convert(List, [])}.
convert([], Acc) -> Acc;
convert([{X, Y}|T], Acc) ->
convert(T, [{binary_to_list(X), Y}|Acc]).
When you want to preserve order of element strightforward version with list comprehension 当你想用list rerehension保存元素strightforward版本的顺序时
convert({List}) ->
{[{binary_to_list(X), Y} || {X, Y} <- List]}.
is the (almost) exact equivalent of 是(几乎)精确等价的
convert({List}) ->
{convert_(List)}.
convert_([]) -> [];
convert_([{X, Y}|T]) ->
[{binary_to_list(X), Y}|convert_(T)].
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