Is there a good way to get involved in the development of this proposal? On Thu, Oct 18, 2018 at 8:01 AM <[email protected]> wrote:
> Send es-discuss mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > https://mail.mozilla.org/listinfo/es-discuss > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of es-discuss digest..." > Today's Topics: > > 1. Re: Has there ever been discussion around a python-like > "with" syntax? (Michael J. Ryan) > > > > ---------- Forwarded message ---------- > From: "Michael J. Ryan" <[email protected]> > To: [email protected] > Cc: [email protected], es-discuss <[email protected]> > Bcc: > Date: Wed, 17 Oct 2018 13:19:17 -0700 > Subject: Re: Has there ever been discussion around a python-like "with" > syntax? > I was going to mention C#'s using statement as well... though I do like > the use of a symbol over Ron's proposal, I think using might be a better > approach. > > -- > Michael J. Ryan > 480-270-4509 <(480)%20270-4509> > https://www.tracker1.info/ > [email protected] > [email protected] > > > On Mon, Oct 15, 2018 at 11:50 AM Till Schneidereit < > [email protected]> wrote: > >> Ron Buckton has a proposal that's quite similar to what you're talking >> about: https://github.com/tc39/proposal-using-statement >> >> On Mon, Oct 15, 2018 at 11:40 AM Dan Aprahamian <[email protected]> >> wrote: >> >>> Hello all! First time posting here. I was curious if there was ever talk >>> about adding something similar to python's with syntax to JS. Obviously we >>> already have a "with" keyword, but I figure we could probably use "use" as >>> the keyword instead. I was thinking something like >>> >>> // Some user defined resource that can be "entered" and "exited" >>> class MyResource { >>> // Function called when entered >>> async [Symbol.enter]() { >>> } >>> >>> // Function called when exited >>> [Symbol.exit]() { >>> } >>> } >>> >>> const resource = new MyResource(); >>> >>> async function useResource() { >>> use myResource { >>> // Inside here, resource has had "acquire" called on it >>> >>> await doSomethingAsync(); >>> // Once this block is finished executing (including async) >>> // release is called >>> } >>> // Release has been called now >>> } >>> >>> Use would effectively be the equivalent of: >>> >>> async function use(resource, body) { >>> await resource[Symbol.enter](); >>> try { >>> await body(); >>> } finally { >>> await resource[Symbol.exit](); >>> } >>> } >>> >>> Has something like this been considered before? >>> >>> Thanks, >>> Dan >>> _______________________________________________ >>> es-discuss mailing list >>> [email protected] >>> https://mail.mozilla.org/listinfo/es-discuss >>> >> _______________________________________________ >> es-discuss mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/es-discuss >> > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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