Default values of destructured arguments?

[Kevin Smith]

>
>
> ```
> function foo({d}={d:1}) {
>
> }
> ```
>
> and
>
> ```
> function foo({d=1}) {
>
> }
> ```
>

Both are allowed in ES6.

The second will throw an error if no actual parameter is provided to the
function, however.  (Because you haven't specified a default for the
parameter.)
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