On Dec 1, 2012, at 8:14 AM, Jason Orendorff wrote: > 1. The current draft spec has Array.prototype.@@iterator() behaving like > .values(), so: > > for (x of ["a"]) > print(x); > > would print the pair ["0", "a"]. > > The proposal had Array iterators producing values only by default. Why the > change? > > (It seems like it could be a typo, or it could be motivated by a desire for > consistency across all collections. If the latter, Map should change, not > Array.)
Note, there is a margin note on of 15.4.4.26 that hi-lites "items" and says "Or should this be values". There are a lot of notes like this in the draft. They are requests for knowledgable reviews to check spec. language that is uncertain for some reason. > > 2. According to 15.4.6.2.2, the iterators produced by Array.prototype.keys > and .items will expose the index values as strings. Why strings? Don't > numbers make more sense? > It does that because array index keys are exposed as strings everywhere else. There is no specific definition (that I can find) of the keys iterator for arrays in the wiki proposal. There is only the general @iter.keys function which is defined in terms of for-in and hence returns string property keys. However, I don't have any objection to return integer keys in this case. Allen _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
