EcmaScript Proposal - Promised functions

[Mike Samuel]

This seems like it could be done with decorators per
https://github.com/tc39/proposal-decorators without introducing a new
keyword.

@promises function sleep(...) {
  ...
}



On Thu, Apr 12, 2018 at 12:07 PM, Luiz Felipe Frazão Gonçalves <
luizfelipefrazaogoncalves at gmail.com> wrote:

> *One new proposal for EcmaScript.*
> Promised Functions
>
> Like async/await, the promised functions would be preceded by a keyword.
> In the case, promised, it would change the default behavior of the
> function, making it behave as a promise.
>
> I will use as an example a classic sleep function:
>
> function sleep(forHowLong) {
>   return new Promise((resolve, reject) => {
>     setTimeout(function() {
>       resolve();
>
>       /**       * For reject:       *        * reject(Error('Some error'));       */
>     }, forHowLong);
>   });
> }
>
> I think to avoid the huge amount of callbacks, there should be a syntax
> similar to this:
>
> promised function sleep(forHowLong) {
>   setTimeout(function() {
>     this.resolve(); // could even create a keyword like "resolve"
>
>     /**     * For reject:     *      * this.reject(Error('Some error'));     */
>   }, forHowLong);
> }
>
> Note that the hypothetical keyword "promised" before the function
> statement makes it act as a promise.
>
> Just a crazy idea I had. :)
>
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