hugoWebsite/node_modules/rxjs/dist/esm/internal/observable/forkJoin.js

40 lines
1.7 KiB
JavaScript

import { Observable } from '../Observable';
import { argsArgArrayOrObject } from '../util/argsArgArrayOrObject';
import { innerFrom } from './innerFrom';
import { popResultSelector } from '../util/args';
import { createOperatorSubscriber } from '../operators/OperatorSubscriber';
import { mapOneOrManyArgs } from '../util/mapOneOrManyArgs';
import { createObject } from '../util/createObject';
export function forkJoin(...args) {
const resultSelector = popResultSelector(args);
const { args: sources, keys } = argsArgArrayOrObject(args);
const result = new Observable((subscriber) => {
const { length } = sources;
if (!length) {
subscriber.complete();
return;
}
const values = new Array(length);
let remainingCompletions = length;
let remainingEmissions = length;
for (let sourceIndex = 0; sourceIndex < length; sourceIndex++) {
let hasValue = false;
innerFrom(sources[sourceIndex]).subscribe(createOperatorSubscriber(subscriber, (value) => {
if (!hasValue) {
hasValue = true;
remainingEmissions--;
}
values[sourceIndex] = value;
}, () => remainingCompletions--, undefined, () => {
if (!remainingCompletions || !hasValue) {
if (!remainingEmissions) {
subscriber.next(keys ? createObject(keys, values) : values);
}
subscriber.complete();
}
}));
}
});
return resultSelector ? result.pipe(mapOneOrManyArgs(resultSelector)) : result;
}
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