[erlang-questions] maps:keys/1, values/1 stability?

[Nathaniel Waisbrot]

The implementation in 18.1 (
https://github.com/erlang/otp/blob/1523be48ab4071b158412f4b06fe9c8d6ba3e73c/erts/emulator/beam/erl_map.c#L2299-L2331)
certainly looks like they use the same ordering.

However, it would _never_ be a good idea to depend on that behavior. If you
need to loop over key/value pairs, use maps:map/2 or maps:fold/3 or
maps:to_list/1.


On Fri, Dec 11, 2015 at 1:35 PM, Kevin Montuori <montuori@REDACTED> wrote:

>
> Hi All --
>
> The maps documenation indicates that keys/1 and values/1 will return
> results in arbitrary order, which makes sense.  I'm wondering if they'll
> return in the *same* arbitrary order.  In other words, is this assertion
> always correct?
>
>   M = maps:from_list(lists:zip(maps:keys(M), maps:values(M))).
>
> Thanks for any insight.
>
> k.
>
> --
>   Kevin Montuori
>   montuori@REDACTED
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