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76 lines
2.3 KiB
76 lines
2.3 KiB
2 years ago
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import { Observable } from '../Observable';
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function dispatch(state) {
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const { obj, keys, length, index, subscriber } = state;
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if (index === length) {
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subscriber.complete();
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return;
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}
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const key = keys[index];
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subscriber.next([key, obj[key]]);
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state.index = index + 1;
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this.schedule(state);
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}
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @extends {Ignored}
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* @hide true
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*/
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export class PairsObservable extends Observable {
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constructor(obj, scheduler) {
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super();
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this.obj = obj;
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this.scheduler = scheduler;
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this.keys = Object.keys(obj);
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}
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/**
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* Convert an object into an observable sequence of [key, value] pairs
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* using an optional IScheduler to enumerate the object.
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*
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* @example <caption>Converts a javascript object to an Observable</caption>
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* var obj = {
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* foo: 42,
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* bar: 56,
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* baz: 78
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* };
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*
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* var source = Rx.Observable.pairs(obj);
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*
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* var subscription = source.subscribe(
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* function (x) {
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* console.log('Next: %s', x);
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* },
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* function (err) {
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* console.log('Error: %s', err);
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* },
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* function () {
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* console.log('Completed');
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* });
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*
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* @param {Object} obj The object to inspect and turn into an
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* Observable sequence.
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* @param {Scheduler} [scheduler] An optional IScheduler to run the
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* enumeration of the input sequence on.
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* @returns {(Observable<Array<string | T>>)} An observable sequence of
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* [key, value] pairs from the object.
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*/
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static create(obj, scheduler) {
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return new PairsObservable(obj, scheduler);
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}
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/** @deprecated internal use only */ _subscribe(subscriber) {
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const { keys, scheduler } = this;
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const length = keys.length;
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if (scheduler) {
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return scheduler.schedule(dispatch, 0, {
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obj: this.obj, keys, length, index: 0, subscriber
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});
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}
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else {
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for (let idx = 0; idx < length; idx++) {
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const key = keys[idx];
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subscriber.next([key, this.obj[key]]);
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}
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subscriber.complete();
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}
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}
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}
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//# sourceMappingURL=PairsObservable.js.map
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