70 lines
2.7 KiB
JavaScript
70 lines
2.7 KiB
JavaScript
import { Observable } from '../Observable';
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import { argsArgArrayOrObject } from '../util/argsArgArrayOrObject';
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import { from } from './from';
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import { identity } from '../util/identity';
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import { mapOneOrManyArgs } from '../util/mapOneOrManyArgs';
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import { popResultSelector, popScheduler } from '../util/args';
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import { createObject } from '../util/createObject';
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import { createOperatorSubscriber } from '../operators/OperatorSubscriber';
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import { executeSchedule } from '../util/executeSchedule';
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export function combineLatest() {
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var args = [];
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for (var _i = 0; _i < arguments.length; _i++) {
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args[_i] = arguments[_i];
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}
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var scheduler = popScheduler(args);
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var resultSelector = popResultSelector(args);
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var _a = argsArgArrayOrObject(args), observables = _a.args, keys = _a.keys;
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if (observables.length === 0) {
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return from([], scheduler);
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}
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var result = new Observable(combineLatestInit(observables, scheduler, keys
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?
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function (values) { return createObject(keys, values); }
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:
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identity));
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return resultSelector ? result.pipe(mapOneOrManyArgs(resultSelector)) : result;
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}
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export function combineLatestInit(observables, scheduler, valueTransform) {
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if (valueTransform === void 0) { valueTransform = identity; }
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return function (subscriber) {
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maybeSchedule(scheduler, function () {
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var length = observables.length;
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var values = new Array(length);
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var active = length;
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var remainingFirstValues = length;
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var _loop_1 = function (i) {
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maybeSchedule(scheduler, function () {
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var source = from(observables[i], scheduler);
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var hasFirstValue = false;
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source.subscribe(createOperatorSubscriber(subscriber, function (value) {
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values[i] = value;
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if (!hasFirstValue) {
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hasFirstValue = true;
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remainingFirstValues--;
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}
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if (!remainingFirstValues) {
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subscriber.next(valueTransform(values.slice()));
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}
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}, function () {
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if (!--active) {
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subscriber.complete();
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}
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}));
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}, subscriber);
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};
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for (var i = 0; i < length; i++) {
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_loop_1(i);
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}
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}, subscriber);
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};
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}
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function maybeSchedule(scheduler, execute, subscription) {
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if (scheduler) {
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executeSchedule(subscription, scheduler, execute);
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}
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else {
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execute();
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}
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}
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//# sourceMappingURL=combineLatest.js.map
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