RxJS | The Reactive Extensions for JavaScript | Reactive Programming library
kandi X-RAY | RxJS Summary
kandi X-RAY | RxJS Summary
The Reactive Extensions for JavaScript (RxJS) is a set of libraries for composing asynchronous and event-based programs using observable sequences and fluent query operators that many of you already know by Array#extras in JavaScript. Using RxJS, developers represent asynchronous data streams with Observables, query asynchronous data streams using our many operators, and parameterize the concurrency in the asynchronous data streams using Schedulers. Simply put, RxJS = Observables + Operators + Schedulers. Whether you are authoring a web-based application in JavaScript or a server-side application in Node.js, you have to deal with asynchronous and event-based programming. Although some patterns are emerging such as the Promise pattern, handling exceptions, cancellation, and synchronization is difficult and error-prone. Using RxJS, you can represent multiple asynchronous data streams (that come from diverse sources, e.g., stock quote, tweets, computer events, web service requests, etc.), and subscribe to the event stream using the Observer object. The Observable notifies the subscribed Observer instance whenever an event occurs. Because observable sequences are data streams, you can query them using standard query operators implemented by the Observable type. Thus you can filter, project, aggregate, compose and perform time-based operations on multiple events easily by using these operators. In addition, there are a number of other reactive stream specific operators that allow powerful queries to be written. Cancellation, exceptions, and synchronization are also handled gracefully by using the methods on the Observable object. But the best news of all is that you already know how to program like this. Take for example the following JavaScript code, where we get some stock data and then manipulate and iterate the results. Now what if this data were to come as some sort of event, for example a stream, such as a WebSocket? Then we could pretty much write the same query to iterate our data, with very little change. The only difference is that we can handle the errors inline with our subscription. And when we're no longer interested in receiving the data as it comes streaming in, we call dispose on our subscription. Note the use of subscribe instead of forEach. We could also use forEach which is an alias for subscribe but we highly suggest you use subscribe.
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QUESTION
I am trying to implement Firebase Realtime Database into a angular project and Im getting stuck at one of the very first steps. Importing AngularFireModule and AngularFireDatabaseModule. It gives me the following error:
...ANSWER
Answered 2021-Aug-26 at 13:20AngularFire 7.0.0 was launched yesterday with a new API that has a lot of bundle size reduction benefits.
Instead of top level classes like AngularFireDatabase, you can now import smaller independent functions.
QUESTION
Apparently throwError(error) is now deprecated. The IntelliSense of VS Code suggests throwError(() => new Error('error'). new Error(...) accepts only strings. What's the correct way to replace it without breaking my HttpErrorHandlerService ?
ANSWER
Answered 2021-Aug-04 at 19:08Instead of this:
QUESTION
I'm trying to connect my app with a firebase db, but I receive 4 error messages on app.module.ts:
...ANSWER
Answered 2021-Sep-10 at 12:47You need to add "compat" like this
QUESTION
When I try to run command ng lint --fix cli throws this error:
ANSWER
Answered 2021-Nov-28 at 10:34From v13 angular doesn't use tslint anymore due to deprecation.
Run ng add @angular-eslint/schematics to add eslint to your application.
It will use tslint-to-eslint-config to migrate you to eslint automatically.
It will generate a .eslintrc.json file and migrate tslint.json to it.
Nothing else is needed to be done.
QUESTION
Imagine a service ABService with a method isAResponsible: () => boolean and two modules: AModule and BModule.
The question is: Is it possible to switch between AModule and BModule depending on what isAResponsible returns? And how do we 'reroute' and rerender if the value of isAResponsible changes? ABService may have several dependencies to other services so it would be preferable to make use of the DI system somehow.
Example:
If the route of interest is /aorb and ABService.isAResponsible returns true, than we would like to route AModule. If ABService.isAResponsible returns false however we want BModule to manage further routing. Note that everything should happen on a shared route.
I tried it with guards and canActivate/canLoad but didn't succeed:
ANSWER
Answered 2021-Dec-17 at 16:50You can you try this instead, I have just checked locally it works, just think it in a different way and you have your solution :)
QUESTION
Note: I think I was able to to reproduce this (see stackblitz example). The error there is printed in the console as "
INTERNAL ASSERTION FAILED: Expected a class definition". This is different to what I get locally but to me this looks like the same issue.Anyway, just comment out line 15 in
app.component.tsand the error will disappear.
I am trying to get started with Firebase but when I install & compile the Angular project I am getting the following error:
Module not found: Error: Package path ./compat is not exported from package /home/sfalk/workspaces/web-mobile/node_modules/firebase (see exports field in /home/sfalk/workspaces/web-mobile/node_modules/firebase/package.json)
The interesting thing is that I am only getting this error when I am injecting my AuthService e.g. like this:
ANSWER
Answered 2021-Dec-02 at 15:09You need to change your import from:
QUESTION
After migrating my angular 6 project to 12. I am getting multiple warning in terminal
if in angular.json i set optimisation: false configuration then all issue get resolved but i don't want to make this changes it should be true only.
with optimisation: true i am getting all these warnings:-
Earlier same code was working fine without any warning.
...ANSWER
Answered 2021-Sep-08 at 10:30I had the same problem. You should change the import of 'assets/.../variables.scss' to './assets/.../variables.scss'. In my case it was in styles.scss but it can be in every .scss file.
QUESTION
I updated rxjs from version 6.x.x to 7.x.x, but following error appeared:
Error in src/app/app.component.ts (12:19) Expected 1 arguments, but got 0.
when trying to next an empty value to the Subject
ANSWER
Answered 2021-Jul-30 at 12:42tl;dr:
Either typecast it with void:
QUESTION
Hello developers i have been literally the whole day trying to implement charts on my proyect , but following the official docs there is not way i could rid off this error :
...ANSWER
Answered 2021-Apr-04 at 07:29I too got the similar problem. I am not sure about the fix.I have resolved by downgrading the charts packages to "ng2-charts": "^2.3.0" and "chart.js": "^2.9.3".
QUESTION
ANSWER
Answered 2021-May-28 at 05:55the solution is:
Delete node_modules and package-lock.json, then run $ npm install again.
You can also try updating your version of node.
Check version with $ node -v, install with $ sudo n stable
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