Support for ECMAScript 'do'-expressions

[CodySchaaf]

Sorry if this has been discussed but it is hard to search for such a generic combination of words.

Is there any plan to implement support for https://github.com/tc39/proposal-do-expressions http://wiki.ecmascript.org/doku.php?id=strawman:do_expressions

It would be awesome to be able to avoid the extra code required when wrapping an if statement in a function to get a dynamic return value.

Thanks!

[aluanhaddad]

These could be quite pleasant to use but unfortunately the proposal is still at Stage 0 in TC39.

[zpdDG4gta8XKpMCd]

I wish it was haskell's do notation

[geverges-oleg]

+1

[steve8708]

looks like this is now in TC39 stage 1 🎉

[zheeeng]

+1 @aluanhaddad What's the accepting standard for ex-next? Is stage 2+ or stage 1 is ok?

[aluanhaddad]

TypeScript tends to adopt proposals once they reach stage 3 in TC39.

This is not a hard and fast rule and there are exceptions such as async/await, which turned out really well, and Decorators, which need a massive overhaul.

[IamManchanda]

As discussed in #20743, I think this should be added in typescript now I really feel so :)

Using kotlin for quite some time and similar syntax for this is quite productive

    message = when {
        (age < 18) -> "You are too young to vote"
        (age == 100) -> "Congratulations"
        else -> "You can vote"
    }

[aluanhaddad]

@IamManchanda see proposal-pattern-matching.

[drhumlen]

Any progress on this one?

[vipcxj]

Any progress on this one?
do expression is very very very useful for react project.