Re: Proposal: defer keyword

how would you handle cleanup after timeouts in https://github.com/tc39/proposal-using-statement? when managing io-complexity at the integration-level, i feel the reliable/zero-magic/verifiable way to guarantee cleanup in all scenarios is stil

Re: Proposal: defer keyword

Could you chime in with this here as an alternative? https://github.com/tc39/proposal-using-statement - Isiah Meadows cont...@isiahmeadows.com www.isiahmeadows.com On Thu, Sep 20, 2018 at 7:36 AM kdex wrote: > > So, when is a function supposed to be invoked when `defer`red in a generator? >

Re: Proposal: defer keyword

So, when is a function supposed to be invoked when `defer`red in a generator? On Thursday, September 20, 2018 11:21:06 AM CEST Ayush Gupta wrote: > Hi, > > I would like to propose a `defer` keyword(or something else as the keyword > name) which would allow us to "defer" a function which will b

Re: Proposal: defer keyword

What stops you from doing this with try...finally? function doSomeDbWork() { try { return databasepool.getConnection(); } finally { connection.release(); } } On Thu, Sep 20, 2018 at 1:01 PM, Ayush Gupta wrote: > Apologies, I meant to use `async-await` in the example but I missed it. > > Al

Re: Proposal: defer keyword

Apologies, I meant to use `async-await` in the example but I missed it. Also, cleanup can be needed in all code, no matter if it's synchronous, uses promises, callbacks, or `async-await`. I personally believe that while we can have different mechanisms for doing cleanup in all different cases, h

Re: Proposal: defer keyword

If you don't need to do anything in the catch block, you can make it a no-op and put your cleanup statement afterward. However framing this in terms of a synchronous use case seems odd given that synchronous database operations (your example) are extremely rare and in JavaScript. It seems to me li

Re: Proposal: defer keyword

It can be covered, but then I'll have to duplicate the `connection.release()` call in both the try and catch blocks, (and remember, there can be multiple resources to be cleaned up). Plus, in case that I have a function with multiple if-else branches with returns from multiple branches, I will hav

Re: Proposal: defer keyword

Hey Ayush, That's an interesting language feature I hadn't heard of before. Any reason your use case couldn't be covered by a try/catch in the synchronous case, and a promise.finally() in the async case? Ben Le jeu. 20 sept. 2018 05 h 21, Ayush Gupta a écrit : > Hi, > > I would like to propos

Proposal: defer keyword

Hi, I would like to propose a `defer` keyword(or something else as the keyword name) which would allow us to "defer" a function which will be executed once the current function either returns or throws. The idea for this is taken from the Go programming language. It would allow us to perform