38 lines
1.7 KiB
JavaScript
38 lines
1.7 KiB
JavaScript
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import { Observable } from '../Observable';
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import { innerFrom } from './innerFrom';
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import { argsOrArgArray } from '../util/argsOrArgArray';
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import { EMPTY } from './empty';
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import { createOperatorSubscriber } from '../operators/OperatorSubscriber';
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import { popResultSelector } from '../util/args';
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export function zip(...args) {
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const resultSelector = popResultSelector(args);
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const sources = argsOrArgArray(args);
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return sources.length
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? new Observable((subscriber) => {
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let buffers = sources.map(() => []);
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let completed = sources.map(() => false);
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subscriber.add(() => {
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buffers = completed = null;
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});
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for (let sourceIndex = 0; !subscriber.closed && sourceIndex < sources.length; sourceIndex++) {
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innerFrom(sources[sourceIndex]).subscribe(createOperatorSubscriber(subscriber, (value) => {
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buffers[sourceIndex].push(value);
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if (buffers.every((buffer) => buffer.length)) {
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const result = buffers.map((buffer) => buffer.shift());
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subscriber.next(resultSelector ? resultSelector(...result) : result);
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if (buffers.some((buffer, i) => !buffer.length && completed[i])) {
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subscriber.complete();
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}
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}
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}, () => {
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completed[sourceIndex] = true;
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!buffers[sourceIndex].length && subscriber.complete();
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}));
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}
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return () => {
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buffers = completed = null;
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};
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})
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: EMPTY;
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}
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//# sourceMappingURL=zip.js.map
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