V8 adds support for top-level await

#1

Post by hayd » Tue, Sep 24, 2019, 9:38 PM UTC

V8 adds support for top-level await
chromium.googlesource.com

Re: V8 adds support for top-level await

#2

Post by miguelmota » Tue, Sep 24, 2019, 9:45 PM UTC

This is huge! Finally no more need to use IIFE's for top level awaits

Re: V8 adds support for top-level await

#3

Post by danappelxx » Tue, Sep 24, 2019, 9:52 PM UTC

miguelmota wrote: post #2

This is huge! Finally no more need to use IIFE's for top level awaits

What is an IIFE?

Re: V8 adds support for top-level await

#4

Post by carreau » Tue, Sep 24, 2019, 9:53 PM UTC

danappelxx wrote: post #3

miguelmota wrote: post #2

This is huge! Finally no more need to use IIFE's for top level awaits

What is an IIFE?

Immediately Invoked Function Expression: (function () { statements })();

Re: V8 adds support for top-level await

#5

Post by CryoLogic » Tue, Sep 24, 2019, 9:53 PM UTC

danappelxx wrote: post #3

miguelmota wrote: post #2

This is huge! Finally no more need to use IIFE's for top level awaits

What is an IIFE?

Immediately invoked function expression - aka an anonymous function that executes as it is interpreted.

    (function() { console.log('test'); })();

In old versions of JavaScript, variables had to be scoped to the nearest function (rather than the nearest block) so IIFE where often used for namespacing:

    var $ = (function() { this.version = '1.2.3'; })();
    $.version; // 1.2.3

This worked because the function would be immediately invoked upon interpretation, scoping it's contents to itself (aliased by the variable name).

Re: V8 adds support for top-level await

#6

Post by 11235813213455 » Tue, Sep 24, 2019, 9:53 PM UTC

danappelxx wrote: post #3

miguelmota wrote: post #2

This is huge! Finally no more need to use IIFE's for top level awaits

What is an IIFE?

he should have said IIAFE actually (immediately-invoked-async-function-expression)

  (async () => { console.log(await 'hello world') })()

Re: V8 adds support for top-level await

#7

Post by tedivm » Tue, Sep 24, 2019, 9:54 PM UTC

Now if only python would do the same.

Re: V8 adds support for top-level await

#8

Post by adrianpike » Tue, Sep 24, 2019, 9:54 PM UTC

danappelxx wrote: post #3

miguelmota wrote: post #2

This is huge! Finally no more need to use IIFE's for top level awaits

What is an IIFE?

Immediately Invoked Function Expression;

(function() { alert('swiggity swooty'); })();

Re: V8 adds support for top-level await

#9

Post by megous » Tue, Sep 24, 2019, 9:56 PM UTC

miguelmota wrote: post #2

This is huge! Finally no more need to use IIFE's for top level awaits

It's nice, I guess, but huge?

Instead of:

    async function main() {
       // code
    }
    main().catch(console.error);

I'll be maybe writing:

    try {
      // code
    } catch (ex) {
      console.error(ex);
    }

Hrm?

Re: V8 adds support for top-level await

#10

Post by lacampbell » Tue, Sep 24, 2019, 9:58 PM UTC

Is this part of the standard?