There is already a proposal for this.

On Tue, Apr 10, 2018, 10:00 Mark Miller <erig...@gmail.com> wrote:

> Yes, please do!
>
>
> On Tue, Apr 10, 2018 at 8:45 AM, Sebastian Malton <sebast...@malton.name>
> wrote:
>
>> I know that this has been brought up before but nothing seems to have
>> come up with it. It also has had a lot of enthusiasm about it. Would me
>> writing up a new proposal for adding the following functions to sets be
>> useful? I would really like to see this through and would be willing to
>> work for it too.
>>
>> The following functions I propose adding to Sets.
>>
>> 1. Union
>> 2. Intersection
>> 3. Difference
>> 4. Symmetric Difference
>> 5. ForEach
>> 6. Map
>> 7. Every
>> 8. Filter
>> 9. Find
>> 10. Some
>>
>> Sebastian Malton
>>
>> _______________________________________________
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>> es-discuss@mozilla.org
>> https://mail.mozilla.org/listinfo/es-discuss
>>
>>
>
>
> --
>   Cheers,
>   --MarkM
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>
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