The iteration protocol has a boolean data property `.done` - I don't know
if anyone ever suggested some kind of `isDone()` method for that, and I
think the iteration protocol sets a precedent of the "tag" on the object
being a primitive.
On Fri, Apr 17, 2020 at 7:25 PM Felipe Gasper
wrote:
> Hello,
>
> If it’s not too awkward of a question to ask: were object methods
> rather than string comparison considered for Promise.allSettled()?
>
> For example, if I write this:
>
> -
> Promise.allSettled(promises).then( results => {
> results.forEach( r => {
> if (r.status === "rejectd") {
> // Failure …
> }
> else {
> // Success!
> }
> } );
> } );
> -
>
> … the code won’t complain about the typo but instead just “do the wrong
> thing”.
>
> But, if the way to parse allSettled()’s resolution were object methods
> instead, it could be this:
>
> -
> Promise.allSettled(promises).then( results => {
> results.forEach( r => {
> if (r.isRejectd()) {
> // Failure …
> }
> else {
> // Success!
> }
> } );
> } );
> -
>
> … which will usefully cause an exception/rejection that pinpoints the
> problem in my code.
>
> Was this pattern perhaps considered and rejected? Or is there some
> liability to the object methods relative to the string comparison that I’m
> not seeing? If so, what was/is the rationale there?
>
> Thank you for your time!
>
> cheers,
> -Felipe Gasper
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