multitude/dist/push/creators/merge.js

Comprehensive streams for push and pull

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.merge = merge;

var _Observable = require("../classes/Observable");

var _intercept = require("../utils/intercept");

var _from = require("./from");

function merge(...arr) {
  if (arr.length < 1) {
    throw Error(`Must provide at least one observable to merge`);
  }

  const observables = arr.map(_from.from);
  if (observables.length === 1) return observables[0];
  return new _Observable.Observable(obs => {
    let completed = 0;
    const subscriptions = observables.map(observable => {
      return obs.closed ? null : (0, _intercept.intercept)(observable, obs, {
        complete() {
          completed++;
          if (completed >= observables.length) obs.complete();
        }

      });
    }).filter(item => Boolean(item));
    return () => {
      for (const subscription of subscriptions) {
        subscription.unsubscribe();
      }
    };
  });
}
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