On 29/02/2008, Lars Hansen <[EMAIL PROTECTED]> wrote:
> What I meant was an assignment operator so that I could write:
>
> { xProp: x, yProp: y } ?= { xProp: 10, yProp: 20 };
>
> and x and y would be overwritten only if their values were undefined.
> C# has a similar operator for conditional assignment which assigns if
> the lhs value is null (??= or something like that, I'm offline and
> away from my bookshelf right now).
>
> How this fits into default arguments I don't know for sure. I
> superficially imagined that ?= would replace = in the parameter list:
>
> function f({ xProp: x, yProp:y } ?= { xProp: 10, yProp: 20 }) ...
>
> The meaning of that should be intuitive and requires fairly lightweight
> changes only.
>
> Lest I get myself into another "goto" problem, I'll make it clear that
> I'm not advocating this for ES4. We're IMO past all deadlines for
> new design. I'm just thinking out loud, for the benefit of ES5 :-)
Fair enough. Although I also hope optional named arguments will make
an appearance in ES5. (They're quite a priority for me personally.)
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