It's not special at all. Actually it is as generic as the current
`Keyword.take/2`. You either want the operation to succeed if there aren't
all keys present or you want it to fail. Those are two equally important
use cases.
On Thursday, December 28, 2023 at 3:21:50 AM UTC+1 rogers...@gmail.com
wrote:
> I don't see such special use cases as good candidates to be included in
> builtins libraries.
>
> Em segunda-feira, 18 de dezembro de 2023 às 07:56:11 UTC-3, DaTrader
> escreveu:
>
>> Many times I need to merge a subset of a keyword list or a map into
>> another keyword list or map while requiring it to fail if not all keys are
>> present.
>>
>> For this purpose I have small utility modules called KwUtils and MapUtils
>> where I have functions like the one below:
>>
>> ```
>> @doc """
>> Takes specified key-value pairs from the keyword list but raises if any
>> not found.
>> """
>> @spec take!( keyword(), [ atom()]) :: keyword()
>> def take!( kw, keys) do
>> taken = Keyword.take( kw, keys)
>>
>> if length( taken) != length( keys) do
>> raise "Expected all keys in #{ inspect( keys)} to be present in #{
>> inspect( kw)}"
>> end
>>
>> taken
>> end
>> ```
>>
>> It'd be nice if a corresponding function was part of the `Keyword` and
>> `Map` modules each.
>>
>>
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