forkJoin.js
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import { Observable } from '../Observable';
import { isArray } from '../util/isArray';
import { map } from '../operators/map';
import { isObject } from '../util/isObject';
import { from } from './from';
export function forkJoin(...sources) {
if (sources.length === 1) {
const first = sources[0];
if (isArray(first)) {
return forkJoinInternal(first, null);
}
if (isObject(first) && Object.getPrototypeOf(first) === Object.prototype) {
const keys = Object.keys(first);
return forkJoinInternal(keys.map(key => first[key]), keys);
}
}
if (typeof sources[sources.length - 1] === 'function') {
const resultSelector = sources.pop();
sources = (sources.length === 1 && isArray(sources[0])) ? sources[0] : sources;
return forkJoinInternal(sources, null).pipe(map((args) => resultSelector(...args)));
}
return forkJoinInternal(sources, null);
}
function forkJoinInternal(sources, keys) {
return new Observable(subscriber => {
const len = sources.length;
if (len === 0) {
subscriber.complete();
return;
}
const values = new Array(len);
let completed = 0;
let emitted = 0;
for (let i = 0; i < len; i++) {
const source = from(sources[i]);
let hasValue = false;
subscriber.add(source.subscribe({
next: value => {
if (!hasValue) {
hasValue = true;
emitted++;
}
values[i] = value;
},
error: err => subscriber.error(err),
complete: () => {
completed++;
if (completed === len || !hasValue) {
if (emitted === len) {
subscriber.next(keys ?
keys.reduce((result, key, i) => (result[key] = values[i], result), {}) :
values);
}
subscriber.complete();
}
}
}));
}
});
}
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