Calling location periodically

locationCheck.js

componentWillMount() {
    ...
    // periodically check device location and write the results to 
    // the location markers
    setInterval(
      this.performLocationChecking.bind(this),
      1000);
  }

  performLocationChecking() {
    if (this.props.appState.currentLocation.coords.latitude) {
        let currentLoc = this.props.appState.currentLocation.coords;
        // for each location marker, perform work in its reducer that stores the distance
        // from the device to the location
        this.props.locations.forEach((location) => {
          this.props.dispatch(actions.locationsActions.writeDistanceResults(
            location.ID,
            geolib.getDistance(
              { latitude: currentLoc.latitude, longitude: currentLoc.longitude },
              { latitude: location.loc[0], longitude: location.loc[1] },
              this.props.config.distanceCheckAccuracy,
              this.props.config.distanceCheckPrecision
            ),
            this.props.config.locationSensitivityDamping
          ));
        });
    }
  }