On Jun 23, 2013, at 1:36 PM, Brendan Eich wrote: > Allen Wirfs-Brock wrote: >> See http://wiki.ecmascript.org/doku.php?id=strawman:array_fill_and_move for >> a strawman proposal for two new Array methods. These are proposed for >> inclusion in ES6. > > I updated the wiki: > > > Discussion > > Q: Does anyone know of a rationale for why (start, end) might be a better > design pattern than (start, count) for such operation? > > A: Array.prototype.slice uses (start, end) where end is a fencepost to > facilitate looping over half-open ranges within a larger range. Spec’ing > count requires subtracting next_start - end, gratuitously. Also, consistency > with slice and range APIs matters. This should be considered carefully in the > design.
Yes, both start,end (slice) and start,count (splice) currently appears in Array methods so it isn't obvious which precedent to follow for best consistency. I could go either way. It would be nice to have a utilitarian-based argument for one or the other. Search result was it because of the -1. allen > > — /Brendan Eich > <mailto:%26%23x62%3B%26%23x72%3B%26%23x65%3B%26%23x6e%3B%26%23x64%3B%26%23x61%3B%26%23x6e%3B%26%23x40%3B%26%23x6d%3B%26%23x6f%3B%26%23x7a%3B%26%23x69%3B%26%23x6c%3B%26%23x6c%3B%26%23x61%3B%26%23x2e%3B%26%23x6f%3B%26%23x72%3B%26%23x67%3B> > 2013/06/23 20:31/ > > > /be > _______________________________________________ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
