JS-Reduce | I 'm here to chew bubblegum and return accumulators
kandi X-RAY | JS-Reduce Summary
kandi X-RAY | JS-Reduce Summary
"I'm here to chew bubblegum and return accumulators."
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QUESTION
I receive my data from an API call. The data is received via ngrx-effects and passed into the state tree. Then I'm able to fetch the data in my angular component's constructor and do some rxjs operations like mergeMap and reduce to convert it to a format that I need to display the data in UI.
I tried replicate the scenario in stackblitz and it's working as expected. Please find the link below
...ANSWER
Answered 2019-Aug-20 at 13:02After 2 hours of struggle found out the issue lies with the usage of reduce operator instead of the scan operator. Since the ngrx state object is not yet complete it was not returning the accumulated array. Once is replaced reduce operator with scan, it started giving me the desired output. The following post helped me in identifying the fix.
QUESTION
I'm using a map-reduce function to merge multiple data inputs into a single object as mentioned here.
The received reduced Object is in the following format:
...ANSWER
Answered 2019-Apr-01 at 12:17You can have 4 levels of nested loops and push the result into an array. To map over an object you can make use of Object.entries to get key-value pairs at each level as an array
QUESTION
I'm trying to take an array and create a nested object from it, where each item in the array, is a property of the previous item.
I think reduce is the way to do this, but I find reduce hard to grasp, and everything I try I get stuck knowing how to push into the next level.
JS: Reduce array to nested objects is a similar question, but I still can't work it having tried many variations of that.
ANSWER
Answered 2018-Nov-27 at 23:20Just use reduce. It works because objects are passed by reference.
QUESTION
Who can kindly explain the accumulator acc construction below in plain English?
...ANSWER
Answered 2017-Aug-15 at 15:19Are you asking about this section?
QUESTION
Neither onNext() nor onCompleted() get called for my subscriber below. I've tried implementing the subscriber via doOnNext()/doOnTerminate(). I also tried doAfterTerminate(). I've also tried explicitly defining a subscriber and neither onNext() nor onCompleted() got called for it.
According to RxJS reduce doesn't continue, it's the reduce() that's not terminating so I tried adding the take(1) but that didn't work. In the same stackoverflow question someone said the problem might be my stream never closes. Aside from take(1), maybe there is some other way I should close the stream, but I don't understand ReactiveX well enough yet.
According to Why is OnComplete not called in this code? (RxAndroid), it could be that the original stream in the series doesn't terminate. But I don't see why that would matter if I'm calling take(1) which I think is supposed to emit a termination signal.
Basically, why doesn't the following line get executed?
...ANSWER
Answered 2017-Apr-29 at 18:30You identified correctly the problem, you're not calling onCompleted() on the source network Observable (at the JsonObjectObservableRequest class), while the take(1) is not helpful either because you put it before the reduce.
As you were probably understood, reduce must operate on Observable with finite number of emissions, as it's emit the accumulated item when all items have been emitted and thus it's relies on the onCompleted() event to know when the observed stream has end.
- I think that in your case, the best thing is to change the way
JsonObjectObservableRequestoperates, you don't need aSubjectfor this, you can use creation methods to wrap a callback (you can see my answer here, and read more about bridging between callback world to RxJava here. - Moreover, you don't need the emit an
Observableof something and thenflatmapit to items, you can simply emit the item withonNext()and emit an error withonError(), actually you're hiding the errors and converting them to an emission, this might make it harder to handle errors down the stream. - You should call
onCompleted()atonResponse()after you callonNext()to signal the completion. and in the case of error, signalingonErrorwill notify termination of the stream. - Another concern is canceling the request which seems not handled in this way, you can read the sources up to see how it can be done when wrapping callbacl call.
QUESTION
I am trying to realize a dashboard to display basic data.
I am actually completely stuck on an issue. Strangely enough, I couldn't find anything even similar to it online, so I don't have many leads on how to move forward.
I have mainly two charts:
- a lineChart called "stackChart" that
- displays consumption as a base layer with its valueAccessor function
- dispalys production as a stacked layer with its value Accessor function
- a barChart called "volumeChart" that is simply the rangeChart for the lineChart
I use radio buttons to select whether to aggregate the grouped data by sum or by average (using the same approach as this example) and then I just use:
...ANSWER
Answered 2017-Jan-17 at 18:30I don't really know dc.js, but it may be possible that you can't change an accessor once it's been set. Try writing a single function for your accessor that will return either the sum or the average, depending on the state of some variable that you can set.
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