Thanks, I was not aware of that.
On Tuesday, January 26, 2021 at 9:48:23 AM UTC+1 [email protected] wrote:
> Hello,
> I think you're looking for `.get_lazy/3` functions.
>
> Best regards,
> Jean
>
>
> Le mardi 26 janvier 2021 à 00:47 -0800, Paweł Urbanek a écrit :
>
> Looks like get does not evaluate the fallback function:
>
> Keyword.get([{:a, 1}], :b, fn () -> 2 + 2 end) => #Function<45.97283095/0
> in :erl_eval.expr/5>
>
> Maybe fetch!/3 could work like that?
>
> Keyword.fetch!([{:a, 1}], :b, fn () -> 2 + 2 end) => 4
> On Tuesday, January 26, 2021 at 9:40:13 AM UTC+1 [email protected] wrote:
>
> Hello,
>
> There is Map.get/3 already, how would this differ?
>
> Best
>
> Adam
>
> On Tue, 26 Jan 2021 at 08:38, Paweł Urbanek <[email protected]>
> wrote:
>
>
> I'd like to propose extending the API for Keyword and Map, fetch! method:
>
> Map.fetch!(%{a: 1}, :b, 2) => 2
> Keyword.fetch!([a: 1], :b, 2) => 2
>
> Third argument represents value which will be returned in case the
> requested key is missing. Optionally maybe it could also accept the
> function which is executed only in case the key is missing and it's return
> value is used.
>
> It would allow a simple way to fallback to default option values.
>
>
>
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