reactive-programming

问题 As i follow some tuts for angular and ember.js I came across the term Two way data binding. Where data displayed on UI are bind with database and any changes to one is quickly propagated to the other. When I started learning meteor.js i came across term "Reactivity" which for me makes same sense as two way data binding. Can you please tell me fundamental difference between these two terms? 回答1: Reactivity is in fact more general than data binding. With reactivity you can implement data

问题 I'm trying to create a Future[List[Int]] from a List[Future[Int]] using a specified ExecutionContext . However, I'm getting errors about a second implicit parameter cbf of type CanBuildFrom . I don't fully understand the purpose of the CanBuildFrom parameter, and I'm getting errors when I try to omit it that look like the following: - not enough arguments for method sequence: (implicit cbf: scala.collection.generic.CanBuildFrom[List[scala.concurrent.Future[Int]],Int,List[Int]] Can someone

问题 I have a question that is related to post How to color sliderbar (sliderInput)?. Is it possible to make the sliderInput change its color dependent on the chosen value? I would like to offer the user to input a value from 0 to 10. However, there is a recommended range from, say, 4 to 8. As a consequence, the slider color should be green if the user chooses a value between 4 and 8, but it should change to orange (or red) if a value outside the recommended range is chosen. Any help on

问题 I have a question that is related to post How to color sliderbar (sliderInput)?. Is it possible to make the sliderInput change its color dependent on the chosen value? I would like to offer the user to input a value from 0 to 10. However, there is a recommended range from, say, 4 to 8. As a consequence, the slider color should be green if the user chooses a value between 4 and 8, but it should change to orange (or red) if a value outside the recommended range is chosen. Any help on

问题 I was wondering if you know of any way to use prolog for stream processing, that is, some kind of reactive programming, or at least to let a query run on a knowledge base that is continuously updated (effectively a stream), and continuously output the output of the reasoning? Anything implemented in the popular "prologs", such as SWI-prolog? 回答1: You can use Logtalk's support for event-driven programming to define monitors that watch for knowledge base update events and react accordingly. You

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . I'm newer in functional programming and functional reactive programming. I read a lot of times the great power of functional reactive programming . Okey; is readable, avoid side effects, etc. But... I don't know how to improve my code in functional/reactive way to execute faster

问题 I'm implementing my first code with https://github.com/ReactiveCocoa/ReactiveCocoa. Is for login a user. The line [subscriber sendNext:user]; is called twice, but I expect to be only one. And the map is not called at all (so autologin is never called) This is my implementation: -(RACSignal *) login:(NSString *)email pwd:(NSString *)pwd { DDLogInfo(@"Login user %@", email); RACSignal *login = [RACSignal createSignal:^ RACDisposable *(id<RACSubscriber> subscriber) { [PFUser

问题 When I create a signal and bring it into the scope of a function, its effective retain count is 0 per Cocoa conventions: RACSignal *signal = [self createSignal]; When I subscribe to the signal, it retains the subscriber and returns a disposable which, per Cocoa conventions, also has a retain count of zero. RACDisposable *disposable = [signal subscribeCompleted:^ { doSomethingPossiblyInvolving(self); }]; Most of the time, the subscriber will close over and reference self or its ivars or some

问题 I'm still figuring out reactive programming so I'm pretty sure this is very basic, but the number of stream transformations is pretty overwhelming to a beginner. I'm creating an Observable from a DOM event. This event should in turn trigger a REST call and all other DOM events will be ignored until this event has been resolved. const stream = Observable.fromEvent(document, 'some-event') stream .flatMap(() => httpRestService()) .subscribe(() => { }) How do I ignore the events from the stream

问题 I'm still figuring out reactive programming so I'm pretty sure this is very basic, but the number of stream transformations is pretty overwhelming to a beginner. I'm creating an Observable from a DOM event. This event should in turn trigger a REST call and all other DOM events will be ignored until this event has been resolved. const stream = Observable.fromEvent(document, 'some-event') stream .flatMap(() => httpRestService()) .subscribe(() => { }) How do I ignore the events from the stream