On Mon, Nov 14, 2011 at 10:42 AM, Rick Waldron <waldron.r...@gmail.com> wrote: > > > On Mon, Nov 14, 2011 at 11:48 AM, John J Barton > <johnjbar...@johnjbarton.com> wrote: >> >> [snip] >> >> Sorry I don't understand. Every function which accepts object >> references and embeds its arguments in [[Prototype]] (either in the >> return value or the instance created from the return value) faces the >> copy-ish problem. > > This is a negligent conflation.
Ouch, that sounds really bad! Except I don't understand what you mean ;-) > Pass by reference is not the same as > ensuring that when extending one object with another, the resulting object > is not implicitly capable of mutating its source objects (as is the case in > Selfish). I don't understand this sentence. I guess you mean: "The issues of extend() is not related to pass by reference vs pass by value." If so, I disagree. If extend() only allows object literals as arguments then you don't have to copy, deep or shallow. That's how syntax like Allen's <| avoids the copy problem. But extend() can't limit its arguments to object literals. So it must deal with copy. Am I wrong? jjb _______________________________________________ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
