Russell Leggett wrote:
On Tue, Jun 12, 2012 at 2:31 PM, Tom Ellis <[email protected]
<mailto:[email protected]>> wrote:
I like the sound of ?= too.
var a;
//later on
a ?= 15;
It goes with all the other operators that are out there too (!=,
=, ==, === etc).
+1, useful and intuitive.
And (to be clear) the semantics for
LeftHandSideExpression ?= AssignmentExpression
are roughly
Let lref = evaluate A.
Let lval = GetValue(lref).
Let rref = evaluate B.
Let rval = GetValue(rref).
Throw a SyntaxError exception if the following conditions are all true:
• Type(lref) is Reference is true
• IsStrictReference(lref) is true
• Type(GetBase(lref)) is Environment Record
• GetReferencedName(lref) is either "eval" or "arguments"
If lval is undefined, call PutValue(lref, rval).
to assign the default value if and only if the left-hand side's current
value is undefined.
/be
- Russ
Tom
On 12 Jun 2012, at 19:04, Brendan Eich wrote:
> Brendan Eich wrote:
>> Is this (A ? B) ? C : D or A ? (B ? C) : D. We can disambiguate
in the formal grammar but readers may rebel.
>
> Or A ? (B ? C : D), of course.
>
> Just say no to lone ? as new operator. I'm warming up to ?= though!
>
> /be
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