Access computation value as return value about fluture

[akolnati]

Will ask on Gitter as this a query more than a issue

[Avaq]

Hi, Firstly thanks for the wonderful package.

You're welcome. And thank you! 🎩

how can i return the output of getPackName [to a variable synchronously]

Your question is quite similar to this one: https://stackoverflow.com/questions/50361976/convert-fluture-future-to-folktale-result

The short answer is you cannot. There's actually no abstraction in JavaScript with which you can do this, because it's a restriction of the language itself.

That said, there's a variety of reasonable alternatives.

1. Access the value in a map or chain, or any other transformation. As long as you need to transform the value somehow, synchronously or asynchronously, there's no reason to extract it from the Future.
2. Access the value by consuming the Future. You can use various different shapes of callbacks, or even a Promise, to execute a Future and continue operating on its values.
3. You can use a coroutine to transform the Future in a synchronous-looking way. So this is just like 1, but the code will look more like how you wanted it to look:

   const main = go(function*(){
     const packageName = yield getPackageName("package.json")
     return `The package is named ${packageName}!`;
   });

   Of course, main now is yet another Future, so you still have to consume it in the end. Just like with Promises, once a function is async, the function calling it must also become async, all the way down to the root of your program. The only difference is that a Promise consumes itself, and a Future has to be explicitly consumed, ideally at the root of your program and nowhere else.

Will ask on Gitter as this a query more than a issue

I'm okay with questions being asked here on GitHub. It's just that sometimes it might take a little while longer for me to notice.

[akolnati]

Thanks. This helps a lot