Proposal: Map.validate/2

[Rudolf Manusadzhian]

It's been a couple of years since Erlang started favoring maps for options to keywords (proplists how it's called there). See https://erlangforums.com/t/handling-options-in-erlang-otp-apis/1133

Recently in an elixir project I tried to also use map for options but faced the lack of the analog of Keyword.validate!/2 which is very handy!

I propose adding a similar function to Map as well.

While I'm not entirely sure about the API. Here I put together a commit where I adapted a lot from Keyword.validate/2

https://github.com/RudolfMan/elixir/commit/5be16e1b5309a0be127f5fa3198a5f0487187463

The result looks like this:

WDYT?

[José Valim]

We don't plan to add this because, although passing options may be common in some Erlang libraries, it is not the case in Elixir, and we don't want to necessarily push folks in that direction. Thank you.

José Valim

https://dashbit.co/

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[Michael Neumann]

Hey Rudolf,

Code looks super nice!

Maps can have arbitrary keys, not just atoms. This is in contrast to Keyword lists, which are defined on atom keys. So, I'd expect that Map.validate would work on any type of key.

Regards,

Michael

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[Generic Jam]

There are already Structs and NimbleOptions https://github.com/dashbitco/nimble_options which kind of do the same thing.

Maybe it's still a good idea but it is totally doable as is.

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[Rudolf Manusadzhian]

Actually, right! I could use struct/2 from Kernel - to convert to an internal struct it would validate the keys and provide with the defaults!

Anyways, it's good to know the official stance on the subject, and I'd better use keyword for options instead of maps as it's the idiomatic way.

Thanks everyone!