I just came here to add the same proposal.
четвер, 28 грудня 2023 р. о 11:40:07 UTC+2 DaTrader пише:
> 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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