On Nov 7, 2011, at 2:18 AM, Andreas Rossberg wrote:
> On 5 November 2011 17:44, Brendan Eich <[email protected]> wrote:
>> Destructuring is "irrefutable" in that it desugars to assignments from
>> properties of the RHS. It is not typed; it is not refutable
>
> I don't think that's true, at least not in the usual sense of
> "irrefutable pattern". Because you can write
>
> let {x} = 666
>
> which will be refuted, by raising a TypeError.
No,
It does ToObject(666) and then looks for the "x" property of the resulting
wrapper object. Assume it does find one (it could, for example because
Number.prototype.x = 42, for example) it assigns the value to x. If it doesn't
find the property it assigns undefined.
For
let {x=5} = 666;
It would assign 5 to x if the "x" property of the wrapper was not found,
>
> Of course, the real question is, what does this do:
>
> let {} = 666
It does ToObject(666)
>
> /Andreas
>
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