On Mar 5, 2008, at 5:58 PM, Jon Zeppieri wrote: > On 3/5/08, Lars Hansen <[EMAIL PROTECTED]> wrote: >> >> Note, the Vector class called as a function does not create a new >> vector if its input is a vector. The prose is wrong in the draft, >> but the code is right. >> >> There probably should be copy() method on the Vector class. > > It's identical to a slice() with no specified parameters.
Thanks for pointing this out. Also equivalent to v.concat() for vector v. True of all array-likes. >> What's the nice invariant? > > An actually fixed length. The proposed 'fixed' field is a debugging > aid. A read-only version, on the other hand, is a guarantee that > holds even if you hand your vector off to code you didn't write and > don't trust. What I have wanted in the past is a variable length vector whose length I can freeze at some point. Akin to sealing an object completely against mutation, after mutating it into good shape during its early lifetime. >> It may be that a set-but-not-reset property is an alternative, >> or that the length must be provided to the constructor and that >> it is fixed after that. Both seem less flexible than the current >> design and I'm not sure what the benefits would really be (apart >> from safety against "hostile" code, but then you wouldn't be >> working in ECMAScript). > > Mingling with others' code is something that already happens on the > web; consider how (legitimate) services get around the cross-site > restrictions browsers implement. I can't imagine security in ES is > going to get less important. Lars's parenthetical aside I interpreted as trolling ;-). I don't believe in a silver bullet for mashup security. On the other hand, for programming-in-the-large sanity if not security, fixed length vectors, fixtures in classes, nominal type relations based on name not structure, namespaces and immutable name bindings -- all of these integrity features help. /be _______________________________________________ Es4-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es4-discuss
