On Mon, Mar 4, 2013 at 10:56 AM, Tab Atkins Jr. <jackalm...@gmail.com> wrote: > On Mon, Mar 4, 2013 at 10:08 AM, <al...@instantbird.org> wrote: >> It would be useful to be able to form the intersection and the union of >> two Sets. These are natural operations that are currently not part of >> the API >> (http://wiki.ecmascript.org/doku.php?id=harmony:simple_maps_and_sets). >> >> Similar methods would make sense for Map, but one would have to think >> about what to do in the case where the key but not the value matches. >> >> An intersection is equivalent to a particular filter, so an alternative >> might be to add a method like Array.filter to Sets instead. >> >> (I filed bug 847355 for this and was told this mailing list was the >> right place for this suggestion.) > > Yes please, and also minus (remove from set A all elements it shares > with set B). All three of these are fairly vital for a lot of code > using sets.
I agree that these methods would be useful. They are common set operations and they do seem missing from the Set draft spec. Peter _______________________________________________ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
