It has been proposed various times.
Checkout https://github.com/elixir-lang/elixir/pull/7172
On Tuesday, 18 December 2018 17:09:12 UTC+1, thia.md...@gmail.com wrote:
>
> Hi,
>
> Would be great if we had in the System module functions similar to those
> that we have right now in the Application module.
>
> `System.get_env/2` could accept a default value similar to
> `Application.get_env/3`. I always find myself using System.get_env("VAR")
> || "DEFAULT VALUE".
>
> And we could have `System.fetch_env/1` and `System.fetch_env!/1`. The
> fetch_env!/1 I would use a lot. Normally you want to raise an error if the
> variable does not exists and would be great if the already existed an
> function to do that. Right we have to use Map.fetch!
> `Map.fetch!(System.get_env(), "VAR")` or create our own custom function
> that raises an error. I think that as it is a common use case would make
> sense to include this functions in the language.
>
> What do you guys think?
>
> Thanks,
> Thiago
>
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