AngularJS observable
From Wiki @ Karl Jones dot com
In AngularJS, the Observable implements the Observer pattern.
Methods
- .subscribe = start and listen to an observable stream.
- .onNext = called when new data arrives.
- .onError = called when error is thrown.
- .onComplete = called when stream is completed.
Compare with promises
Observables are similar to promises.
toPromise
Observables can be converted to promises using the toPromise method.
Error handling
Chain the .catch method on an Observable.
Pass in a callback sign a single error argument.
