Brendan Eich-3 wrote
> Allen Wirfs-Brock wrote:
>> Do you have any real world use cases in mind that are driving the desire
>> for 
>> Array.from to preserve sparseness?
> 
> Use-cases for sparse arrays + copying them would be really helpful.

It was more call for a consistency, as all other methods are gentle to
sparse arrays, this one suddenly isn't and I was wondering what's the reason
for that.

It also brings confusion. I try to follow same patterns designing methods
that are not part of a standard, and now it's hard to decide how to handle
sparse arrays case, as it's in `map` or as in `from` (?)

However if you ask me for real world cases for sparse arrays, none comes to
my mind now. Personally I don't really use them (I think), but it'll be good
to hear from others.





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Brendan Eich wrote

> Use-cases for sparse arrays + copying them would be really helpful.

It was more call for a consistency, as all other methods are gentle to
sparse arrays, this one suddenly isn't and I was wondering what's the reason
for that.

It also brings confusion. I try to follow same patterns designing methods
that are not part of a standard, and now it's hard to decide how to handle
sparse arrays case, as it's in `map` or as in `from` (?)

However if you ask me for real world cases for sparse arrays, none comes to
my mind now. Personally I don't really use them (I think), but it'll be good
to hear from others.