JavaScript async/await implemented in V8

Re:JavaScript async/await implemented in V8 by BinaryIdiot on Tuesday May 17, 2016 @12:36AM (#11711368)

That seems like a mistake to me. That would mean code that runs perfectly under, say, 6.5 would not run on 6.1. It should most certainly be a 7.x release.

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Re:JavaScript async/await implemented in V8 by sublimino on Tuesday May 17, 2016 @04:20AM (#11712012)

This is intentional - it's a feature, not a breaking change, although the docs do identify a greater possibility of regressions until LTS. From https://nodejs.org/en/blog/release/v6.0.0/

> The general rule for deciding which version of Node.js to use is:

> ...

> - Upgrade to Node.js v6 if you have the ability to upgrade versions quickly and want to play with the latest features as they arrive.

> Note that while v6 will eventually transition into LTS, until it does, we will still be actively landing new features (semver-minor). This means that there is an increased chance for regressions to be introduced..

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Re:JavaScript async/await implemented in V8 by coldtea on Tuesday May 17, 2016 @06:57AM (#11712532)

For stability one should be using the LTS release.

And why would one downgrade from 6.5 to 6.1? If they code for 6.1 and want to not use LTS and to keep 6.1 installations around, then they should not use 6.5 features.

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Re:JavaScript async/await implemented in V8 by BinaryIdiot on Tuesday May 17, 2016 @08:02PM (#11718657)

It was simply a hypothetical but surely you can imagine a scenario where you either have to downgrade (perhaps a regression happens) or you simply have to target multiple versions. I've run into both situations multiple times in my career.

Regardless yes you should use LTS but that's no excuse for going against semantic versioning. It should be labeled an alpha or beta if they don't want to change major versions for breaking feature additions.

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Re:JavaScript async/await implemented in V8 by coldtea on Wednesday May 18, 2016 @07:17AM (#11721101)

>It was simply a hypothetical but surely you can imagine a scenario where you either have to downgrade (perhaps a regression happens)

Sure, but if you might have to downgrade, then simply don't write code that depends on 6.5 features. 6.5 can still run 6.1 code (feature wise), so you'll be alright.

The only problem would be for people wanting to a) run 6.5, b) take advantage of newer, 6.5-only features, and THEN c) downgrade to 6.1

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Re:JavaScript async/await implemented in V8 by BinaryIdiot on Thursday May 19, 2016 @02:12AM (#11728357)

> Sure, but if you might have to downgrade, then simply don't write code that depends on 6.5 features.

Ah but see that's the rub. Hindsight is always 20/20. I've actually run into similar issues in the past. Ultimately if they're consistent with versions then it's not the biggest deal (because if you have an issue with 6.5 there is probably a good chance you have an issue with 6.1 as well) but with semantic versioning I always expect code written against the major version to always work across all minor versions unless it relied on some weird bug side effect.

It just seems really inconsistent to me.

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