@reactivex/rxjs/dist/es6/observable/ArrayLikeObservable.js

Reactive Extensions for modern JavaScript

import { Observable } from '../Observable';
import { ScalarObservable } from './ScalarObservable';
import { EmptyObservable } from './EmptyObservable';
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
export class ArrayLikeObservable extends Observable {
    constructor(arrayLike, mapFn, thisArg, scheduler) {
        super();
        this.arrayLike = arrayLike;
        this.scheduler = scheduler;
        if (!mapFn && !scheduler && arrayLike.length === 1) {
            this._isScalar = true;
            this.value = arrayLike[0];
        }
        if (mapFn) {
            this.mapFn = mapFn.bind(thisArg);
        }
    }
    static create(arrayLike, mapFn, thisArg, scheduler) {
        const length = arrayLike.length;
        if (length === 0) {
            return new EmptyObservable();
        }
        else if (length === 1 && !mapFn) {
            return new ScalarObservable(arrayLike[0], scheduler);
        }
        else {
            return new ArrayLikeObservable(arrayLike, mapFn, thisArg, scheduler);
        }
    }
    static dispatch(state) {
        const { arrayLike, index, length, mapFn, subscriber } = state;
        if (subscriber.isUnsubscribed) {
            return;
        }
        if (index >= length) {
            subscriber.complete();
            return;
        }
        const result = mapFn ? mapFn(arrayLike[index], index) : arrayLike[index];
        subscriber.next(result);
        state.index = index + 1;
        this.schedule(state);
    }
    _subscribe(subscriber) {
        let index = 0;
        const { arrayLike, mapFn, scheduler } = this;
        const length = arrayLike.length;
        if (scheduler) {
            return scheduler.schedule(ArrayLikeObservable.dispatch, 0, {
                arrayLike, index, length, mapFn, subscriber
            });
        }
        else {
            for (let i = 0; i < length && !subscriber.isUnsubscribed; i++) {
                const result = mapFn ? mapFn(arrayLike[i], i) : arrayLike[i];
                subscriber.next(result);
            }
            subscriber.complete();
        }
    }
}
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