@lifaon/rx-js-light/src/observable/built-in/from/without-notifications/many-observables/combine-latest/combine-latest.mjs

Blazing fast Observables

import {single} from "../../values/single/single.mjs";
export function combineLatest(observables) {
  const length = observables.length;
  if (length === 0) {
    return single([]);
  } else {
    return emit => {
      const values = Array.from({
        length
      });
      const received = Array.from({
        length
      });
      let receivedCount = 0;
      const unsubscribe = observables.map((subscribe, index) => {
        return subscribe(value => {
          values[index] = value;
          if (!received[index]) {
            received[index] = true;
            receivedCount++;
          }
          if (receivedCount === length) {
            emit(values);
          }
        });
      });
      return () => {
        for (let i = 0, l = unsubscribe.length; i < l; i++) {
          unsubscribe[i]();
        }
      };
    };
  }
}