import { OuterSubscriber } from '../OuterSubscriber'; import { subscribeToResult } from '../util/subscribeToResult'; export function withLatestFrom(...args) { return (source) => { let project; if (typeof args[args.length - 1] === 'function') { project = args.pop(); } const observables = args; return source.lift(new WithLatestFromOperator(observables, project)); }; } class WithLatestFromOperator { constructor(observables, project) { this.observables = observables; this.project = project; } call(subscriber, source) { return source.subscribe(new WithLatestFromSubscriber(subscriber, this.observables, this.project)); } } class WithLatestFromSubscriber extends OuterSubscriber { constructor(destination, observables, project) { super(destination); this.observables = observables; this.project = project; this.toRespond = []; const len = observables.length; this.values = new Array(len); for (let i = 0; i < len; i++) { this.toRespond.push(i); } for (let i = 0; i < len; i++) { let observable = observables[i]; this.add(subscribeToResult(this, observable, undefined, i)); } } notifyNext(_outerValue, innerValue, outerIndex) { this.values[outerIndex] = innerValue; const toRespond = this.toRespond; if (toRespond.length > 0) { const found = toRespond.indexOf(outerIndex); if (found !== -1) { toRespond.splice(found, 1); } } } notifyComplete() { } _next(value) { if (this.toRespond.length === 0) { const args = [value, ...this.values]; if (this.project) { this._tryProject(args); } else { this.destination.next(args); } } } _tryProject(args) { let result; try { result = this.project.apply(this, args); } catch (err) { this.destination.error(err); return; } this.destination.next(result); } } //# sourceMappingURL=withLatestFrom.js.map