thanks for the clarification -- stefan Brendan Eich wrote: > On Aug 16, 2007, at 10:42 AM, Lars T Hansen wrote: > >> On 8/16/07, Stefan Gössner <[EMAIL PROTECTED]> wrote: >>> Hello, >>> here are my first questions after following the list quite a while. >>> >>> 1. I really like the array slice syntax [start:end:step] described in >>> http://developer.mozilla.org/es4/proposals/slice_syntax.html >>> >>> The description seems to miss the case, where 'start' is greater >>> than 'end'. >>> >>> a[5:2] >>> >>> Will >>> (a) 'step' be implicitely set to -1 ? >>> (b) an empty array come as result ? >>> (c) an error occur ? >> The description seems to be clear here, the result should be an >> empty array. > > Same as for Python: > > >>> s = [1,2,3] > >>> s[2:1] > [] > >>> 2. The descendant operator '..' is mentioned only in the tutorial >>> introduction. >>> http://developer.mozilla.org/es4/spec/ >>> chapter_1_tutorial_introduction.html >>> I could not find it mentioned elsewhere. >>> >>> Is it also considered to work with array notation as in: >>> >>> y..[0] // access the first element of all arrays of 'y' and it's >>> descendants. >> I don't think so. The descendant operator is for E4X (ECMAScript for >> XML, ECMA-357) and has not been discussed in other contexts. E4X is >> not included in ECMAScript 4 at this stage. > > We are reserving E4X syntax but not requiring it to be supported. > > The .. operator bugs me because it implicitly quotes its right > operand (as . does), so you could not use it as Perl and other > languages do for range operator. If it were a dyadic operator that > did not quote either operand, than it could be overridden by the > operators proposal (or an operators proposal, at any rate ;-) and > made to work for range (integer literal or value on left) as well as > for E4X (XML on left). > > Generalizing query, matching, and filtering from E4X to the whole > language, cleaning up the "un-JavaScript-y" aspects of E4X, making > use of practical research such as JMatch [1], all will have to wait > for a future Edition. But we certainly can discuss ideas here. Please > feel free to do so. > > /be > > [1] http://www.cs.cornell.edu/Projects/jmatch/ > _______________________________________________ > Es4-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es4-discuss >
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