This would be hugely useful for string interpolation since it would let structured interpolation results transparently behave as strings in many respects.
2010/1/28 Brendan Eich <[email protected]> > Value types would be objects that behave like primitives such as number and > string: they are immutable or appear to be, so can be memoized and compared > freely without object identity breaking value identity (in general; decimal > cohort issues notwithstanding). > > The Ecma TC39 committee is in favor of exploring adding value types to > allow library authors to implement types such as Decimal, Rational, Complex, > Quaternion, RGBColor, etc. In order to be usable, value types must > "overload", really dispatch from, operator syntax; they also need to extend > literal syntax (e.g. 1.1m for decimal 1.1). > > I'm mailing to let folks know about a new wiki page. It's not a proper > strawman proposal yet, alas -- it's my notes from an ad-hoc meeting last > October. But it will become a strawman with enough work, including valuable > feedback from es-discuss. > > Here's the wiki link: > > http://wiki.ecmascript.org/doku.php?id=strawman:value_types > > The issues raised include dispatch design, literal syntax, whether the > built-in primitives can or should be recast as value types, and which > operators are overloadable. Of course, this is an incomplete list of open > issues. > > It references (via hyperlinks) thread-head messages on es-discuss with > subjects containing "Operator overloading": > > https://mail.mozilla.org/pipermail/es-discuss/2009-January/008535.html(Mark > Miller's double-dispatch proposal) > > https://mail.mozilla.org/pipermail/es-discuss/2009-June/009603.html(Christian > Hansen's pretty-much-multimethods-but-with-prototype-mutation > counterproposal) > > https://mail.mozilla.org/pipermail/es-discuss/2009-October/010068.html(Jason > Orendorff's post about what should be overloadable) > > The meeting we had last October was productive, but I'm sorry to say we > didn't have followup meetings since then. But we should, and I'll help keep > the list and wiki updated. So please feel free to reply to this message if > you have something to add. Thanks, > > /be > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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