RxJS Observable.
        
        
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Methods
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    subscribe(onNext, onError, onNext)
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    Subscribes to the observable.Parameters:Name Type Description onNextfunction the callback called for each element in the sequence. onErrorfunction the callback called upon exceptional termination of the sequence. onNextfunction the callback called upon graceful termination of the sequence. - Source:
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 Exampleobservable.subscribe( function (x) { console.log('New item', x); }, function (err) { console.error(err); }, function () { console.log('Completed'); } );