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Subject

A Subject is a special type of Observable that allows values to be multicasted to many Observers. Subjects are like EventEmitters.

Every Subject is an Observable and an Observer. You can subscribe to a Subject, and you can call next to feed values as well as error and complete.

class Subject<T> extends Observable<T> implements SubscriptionLike {

constructor();

private currentObservers;

closed: boolean;

hasError: boolean;

isStopped: boolean;

get observed(): boolean;

observers: Observer<T>[];

thrownError: any;

asObservable(): Observable<T>;

complete(): void;

error(err: any): void;

lift<R>(operator: Operator<T, R>): Observable<R>;

next(value: T): void;

unsubscribe(): void;

static create: (...args: any[]) => any;

}

§Type Parameters

T

§Extends

Observable<T>

§Implements

SubscriptionLike

§Constructors

new Subject()

§Properties

currentObservers

closed: boolean

hasError: boolean

isStopped: boolean

observed: boolean readonly

observers: Observer<T>[]

thrownError: any

§Methods

asObservable(): Observable<T>

Creates a new Observable with this Subject as the source. You can do this to create custom Observer-side logic of the Subject and conceal it from code that uses the Observable.

@return

Observable that the Subject casts to

complete(): void

error(err: any): void

lift<R>(operator: Operator<T, R>): Observable<R> deprecated

@deprecated

Internal implementation detail, do not use directly. Will be made internal in v8.

next(value: T): void

unsubscribe(): void

§Static Properties

create: (...args: any[]) => any

Creates a "subject" by basically gluing an observer to an observable.