hugoWebsite/node_modules/rxjs/dist/esm5/internal/observable/combineLatest.js

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2022-10-29 00:20:35 +02:00
import { Observable } from '../Observable';
import { argsArgArrayOrObject } from '../util/argsArgArrayOrObject';
import { from } from './from';
import { identity } from '../util/identity';
import { mapOneOrManyArgs } from '../util/mapOneOrManyArgs';
import { popResultSelector, popScheduler } from '../util/args';
import { createObject } from '../util/createObject';
import { createOperatorSubscriber } from '../operators/OperatorSubscriber';
import { executeSchedule } from '../util/executeSchedule';
export function combineLatest() {
var args = [];
for (var _i = 0; _i < arguments.length; _i++) {
args[_i] = arguments[_i];
}
var scheduler = popScheduler(args);
var resultSelector = popResultSelector(args);
var _a = argsArgArrayOrObject(args), observables = _a.args, keys = _a.keys;
if (observables.length === 0) {
return from([], scheduler);
}
var result = new Observable(combineLatestInit(observables, scheduler, keys
?
function (values) { return createObject(keys, values); }
:
identity));
return resultSelector ? result.pipe(mapOneOrManyArgs(resultSelector)) : result;
}
export function combineLatestInit(observables, scheduler, valueTransform) {
if (valueTransform === void 0) { valueTransform = identity; }
return function (subscriber) {
maybeSchedule(scheduler, function () {
var length = observables.length;
var values = new Array(length);
var active = length;
var remainingFirstValues = length;
var _loop_1 = function (i) {
maybeSchedule(scheduler, function () {
var source = from(observables[i], scheduler);
var hasFirstValue = false;
source.subscribe(createOperatorSubscriber(subscriber, function (value) {
values[i] = value;
if (!hasFirstValue) {
hasFirstValue = true;
remainingFirstValues--;
}
if (!remainingFirstValues) {
subscriber.next(valueTransform(values.slice()));
}
}, function () {
if (!--active) {
subscriber.complete();
}
}));
}, subscriber);
};
for (var i = 0; i < length; i++) {
_loop_1(i);
}
}, subscriber);
};
}
function maybeSchedule(scheduler, execute, subscription) {
if (scheduler) {
executeSchedule(subscription, scheduler, execute);
}
else {
execute();
}
}
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