Rick Waldron wrote:
On Mon, Oct 1, 2012 at 8:40 PM, Nicholas C. Zakas <[email protected] <mailto:[email protected]>> wrote:I've been playing around with the Set prototypes in Firefox and Chrome (knowing full well that they are incomplete and the spec hasn't been finalized yet), and I wanted to share a couple of learnings. First, since a Set can be initialized with an array, it stands to reason that you should be able to easily get an array back from the set. However, there is no way to do that right now short of using a loop and manually constructing an array. I would really like to see a *Set.prototype.toArray* method to easily change the Set back into an array. A simple use case would be de-duping an array: function dedupe(array) { return (new Set(array)).toArray(); }In July, Array.from was upgraded to also accept objects with iterators (in addition to Array-likes). Set is an iterator
Nit: "Set is an iterable" or "Set has an iterator". /be
, so it could be used to construct a new array: function dedupe(array) { return Array.from(new Set(array)); } Rick Second, the lack of visibility into Sets is problematic. A very simple use case is when I want to see if the Set has been initialized yet but I can't know what keys might have been used at that point in time. Firefox implements a *Set.prototype.size* method which is useful to know what I'm dealing with. However, I'm not sure how frequently the number of items in the Set actually matters, so a *Set.prototype.isEmpty* would be equally useful for this case. Otherwise, I'm finding Sets very useful as a replacement for objects that I was using for the same purpose. Thanks, Nicholas-- ___________________________Nicholas C. Zakas http://www.nczonline.net _______________________________________________ es-discuss mailing list [email protected] <mailto:[email protected]> https://mail.mozilla.org/listinfo/es-discuss _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
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