File.slice was first supported in Firefox 4. - Kyle On Tue, Apr 12, 2011 at 1:08 PM, Jian Li <jianli@chromium.org> wrote: > The biggest concern is that this is a breaking change and quite a few web > applications have already been using it. As far as I know, File.slice(start, > length) has been supported as early as Chrome 6 and Safari 5. Also Firefox 3 > is supporting it. How do we communicate with web developers about this > breaking change if we decide to make the change? > > Jian > > > On Tue, Apr 12, 2011 at 11:34 AM, Arun Ranganathan <arun@mozilla.com>wrote: > >> On 4/12/11 2:24 PM, Jonas Sicking wrote: >> >>> Hi All, >>> >>> It was recently (yesterday) pointed out to me that we let a bad >>> spec-bug slip through for File.slice. It doesn't match the argument >>> semantics of Array.slice which can be very confusing for developers. >>> >>> In Array.slice the second argument is the index of the last item to be >>> included in the returned slice. >>> In File.slice the second argument is the number of bytes included in >>> the returned slices. >>> >>> In other words, it's Array.slice(start, end), but File.slice(start, >>> length). >>> >>> Additionally, in Array.slice the second argument is optional. >>> >>> File.slice is currently shipped by Chrome and Firefox 4. I would be >>> fine with fixing this in Firefox 4.0.1, however that only makes sense >>> if the chrome folks are fine with fixing it in their implementation. >>> >>> So consider this an official request, would chrome be ok with changing >>> the spec here? >>> >>> / Jonas >>> >>> >> I'm bummed that we collectively let this slip through the cracks, and >> personally think it's early enough to fix it. But we should also decide how >> closely to match Array.slice. Should we allow code of the sort >> >> file.slice(-80)? >> >> Code of that sort is allowed with Array.slice. >> >> MDC has good developer docs about what's in Firefox for Array.slice: >> >> >> https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/slice >> >> Developers may have already discovered file.slice (e.g. see >> http://hacks.mozilla.org/2011/04/resumeupload/), so fixing this will >> involve some messaging. >> >> -- A* >> >> >
Received on Tuesday, 12 April 2011 20:15:07 UTC