IsConstructor

[C. Scott Ananian]

On Wed, Jun 11, 2014 at 11:05 AM, Boris Zbarsky <bzbarsky at mit.edu> wrote:
> On 6/11/14, 10:58 AM, Rick Waldron wrote:
>>
>> function isConstructor(C) {
>>    try {
>>      new C();
>
>
> This will fail for constructors that require actual arguments, right?
>
> For example, this will fail if C === window.Worker in a browser.

It will also fail for the uses of `IsConstructor` in the promise spec,
as `Promise` constructors throw `TypeError` unless they are passed a
callable `resolve` argument (IIRC).
  --scott