On Nov 12, 2012, at 3:03 PM, Erik Arvidsson wrote: > On Mon, Nov 12, 2012 at 5:39 PM, Allen Wirfs-Brock <[email protected]> > wrote: > So the question on the floor: is there any interest in having this variation > of array iteration in ES6? > > I would prefer not. Sparse arrays are really rare and for the few cases these > are used I expect the author to be willing to pay a little bit extra instead > of everyone else having to pay for these rare cases.
What's the "everyone else" cost? If you don't request sparseness you get a dense iteration and since this is determined when the iterator is created an implementation can select a minimum cost algorithm. Allen
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