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I've been addicted to Rx since I started using ReactiveCocoa in my iOS applications. I was disappointed looking at Dart initially when I saw it was heavily futu

by myko 12y ago

I've been addicted to Rx since I started using ReactiveCocoa in my iOS applications. I was disappointed looking at Dart initially when I saw it was heavily future based and not observable/signal based. I haven't looked at Dart in awhile but I hope this means Rx style composability/async/error handling is in Dart's future.

tosh 12y ago
You might like `frappe` https://github.com/danschultz/frappe https://github.com/danschultz/frappe a bacon.js inspired library for Dart.
xxgreg 12y ago
Could you explain what you're missing from Rx that isn't already supported by Dart's core library. For example in Dart Iterables and Streams already have: where, skip, take, map, fold, reduce, expand (which is flatMap or mapcat), as well as a few others. https://api.dartlang.org/apidocs/channels/be/dartdoc-viewer/dart:async.Stream https://api.dartlang.org/apidocs/channels/be/dartdoc-viewer/... https://api.dartlang.org/apidocs/channels/be/dartdoc-viewer/dart:core.Iterable https://api.dartlang.org/apidocs/channels/be/dartdoc-viewer/... https://rx.codeplex.com/ https://rx.codeplex.com/
- spankalee 12y ago
  To me the only thing that's missing is a Property object - a Stream with a current value. I've ended up implementing it a few times already.
- danschultz 12y ago
  Dart's Stream class is missing many of the composition, transformation and termination methods that you'd find in other FRP libraries. It's also lacking a concept of time-varying values, which to me are important for holding and responding to state changes. Having functions like flatMapLatest, flatMap, combine, merge, scan, and takeUntil are pretty much essential to building any RX heavy application. There are some packages out there that extend Dart's streams to add this behavior. One of which I'm the author of, Frappe. Of course, it'd be nice if Dart included this stuff out of the box. https://github.com/danschultz/frappe https://github.com/danschultz/frappe
  - xxgreg 12y ago
    I thought Stream.expand(f) is flatMap. i.e. From docs: "Creates a new stream from this stream that converts each element into zero or more events." Stream.takeWhile(f) is takeUntil with the return value of the f argument negated. But sure, you can always add more features to a core library, the difficult decision is when to stop, and leave the rest to libraries.

by myko 12y ago

tosh 12y ago

You might like `frappe` https://github.com/danschultz/frappe https://github.com/danschultz/frappe a bacon.js inspired library for Dart.

xxgreg 12y ago

Could you explain what you're missing from Rx that isn't already supported by Dart's core library. For example in Dart Iterables and Streams already have: where, skip, take, map, fold, reduce, expand (which is flatMap or mapcat), as well as a few others. https://api.dartlang.org/apidocs/channels/be/dartdoc-viewer/dart:async.Stream https://api.dartlang.org/apidocs/channels/be/dartdoc-viewer/... https://api.dartlang.org/apidocs/channels/be/dartdoc-viewer/dart:core.Iterable https://api.dartlang.org/apidocs/channels/be/dartdoc-viewer/... https://rx.codeplex.com/ https://rx.codeplex.com/

spankalee 12y ago
To me the only thing that's missing is a Property object - a Stream with a current value. I've ended up implementing it a few times already.
danschultz 12y ago
Dart's Stream class is missing many of the composition, transformation and termination methods that you'd find in other FRP libraries. It's also lacking a concept of time-varying values, which to me are important for holding and responding to state changes. Having functions like flatMapLatest, flatMap, combine, merge, scan, and takeUntil are pretty much essential to building any RX heavy application. There are some packages out there that extend Dart's streams to add this behavior. One of which I'm the author of, Frappe. Of course, it'd be nice if Dart included this stuff out of the box. https://github.com/danschultz/frappe https://github.com/danschultz/frappe
- xxgreg 12y ago
  I thought Stream.expand(f) is flatMap. i.e. From docs: "Creates a new stream from this stream that converts each element into zero or more events." Stream.takeWhile(f) is takeUntil with the return value of the f argument negated. But sure, you can always add more features to a core library, the difficult decision is when to stop, and leave the rest to libraries.