Arrow functions, this and that, in V8

[Bruce Mcpherson]

Arrow functions can help you create nice code with less clutter, but they are not just syntactic sugar. As you are moving over to V8, here's an intro into what's changed to help.

https://ramblings.mcpher.com/apps-script/apps-script-v8/javascript-v8-arrow-functions-this-and-that/

[Tanaike]

I think that it is a good information. I would like to study from it. Thank you so much.

[Andrew Apell]

Thanks Bruce,

I was once firmly in the "syntactic sugar" camp but posts like these are moving me away... slowly.

BTW, is there any issue with JSON and the new V8 runtime? Or does it work the same as it was in Rhino?

[Bruce Mcpherson]

Can't think of any json implications - do you have a specific concern?

[Andrew Apell]

Just a hunch but my authentication flow, which depends on JSON (the only "prominent" line of code in my work), was failing until I switched back to Rhino.

Of course, I need to do more investigating before I can isolate the issue.

[Andrew Apell]

Hello Bruce,

In V8, do I need to use Promises when using UrlFetchApp?

[Bruce Mcpherson]

No

In fact Apps Script is Synchronous, so Promises are only for compatibility so you can perhaps share the same code between client and server side. UrlFetch doesn't return a Promise, so you'd anyway need to construct one. 

These two calls are equivalent

function myFunction() {

  const url = 'http://climatedataapi.worldbank.org/climateweb/rest/v1/country/mavg/tas/2020/2039/gbr'

  const result = UrlFetchApp.fetch(url)

  Logger.log(result)

  const p = new Promise ((resolve, reject) => {

    const result = UrlFetchApp.fetch(url)

    resolve(result)

  })

  p.then(result=> {

    Logger.log(result)

  })

}

On Fri, 13 Mar 2020 at 12:37, Andrew Apell <chis...@gmail.com> wrote:

Hello Bruce,

In V8, do I need to use Promises when using Urlfetch?

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[Andrew Apell]

👍

Thanks. That saves me from rewriting many lines of code... been dodging promises for a long time :)

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[Bruce Mcpherson]

btw - the async/await syntax is also supported, but of course does nothing since apps script is synchronous.

  (async (url) => {

    const result = await new Promise ((resolve, reject) => {

      const result = UrlFetchApp.fetch(url)

      resolve(result)

    })

    Logger.log(result)

  })('http://climatedataapi.worldbank.org/climateweb/rest/v1/country/mavg/tas/2020/2039/gbr')

👍

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[Alex]

At some point, I believed in something else =) I wanted a little parallelism.

Thank you Bruce!

This is great content!