> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Jon Zeppieri > Sent: 2. april 2008 19:06 > To: Lars Hansen > Cc: es4-discuss@mozilla.org > Subject: Re: Strict mode recap > > On 4/2/08, Lars Hansen <[EMAIL PROTECTED]> wrote: > > > > > > Lars, does this mean that expr::[expr] can't introduce > > lexical > > bindings? Or: in strict mode, it can't, but in > standard it can? > > > > > > It can't introduce bindings; it's just a name. > > I meant something like: > > var foo::[bar] = baz; > > My objection to expr::[expr] in earlier messages was based on > the assumption that these computed names could be used on the > left-hand side of an assignment expression -- which, I'm > pretty sure, is syntactically valid.
But that by itself can't introduce bindings (except global ones). > So, for example: > > var foo = "hello"; > null::["foo"] = "goodbye"; > print(foo); // prints "goodbye" > > But I guess there are two cases: one where a new binding > would be introduced and another where the expression would > evaluate to an already bound name (as in the previous example). > > So... are either of those cases legal? If you want to introduce a new binding then you have to do eg ns var x = E to introduce ns::x, and ns has to reference a namespace definition, so it's not variable. Nor is the x, obviously. But in that case: var v1 = ns var v2 = "x" v1::[v2] = 20 updates ns::x, AFAIK. Nothing you can't do with lexically scoped eval. --lars _______________________________________________ Es4-discuss mailing list Es4-discuss@mozilla.org https://mail.mozilla.org/listinfo/es4-discuss
