Having trouble understanding heartRateZone.

[jlpeyton]

I'm trying to request the user's heart rate zone using HeartRateZone(). As far as I understand it's done by using this code:

console.log(user.heartRateZone(hrm.heartRate));

I'm getting this error though:

Unhandled TypeError: Argument at index 0 is not a Number

Any help would be appreciated, thanks!

[JonFitbit · Accepted solution]

Try this, sorry it's untested.

import { HeartRateSensor } from "heart-rate";
import { user } from "user-profile";

let lastReading = 0;
let hrm = new HeartRateSensor();

hrm.start();

hrm.onreading = function() {
 if (hrm.timestamp === lastReading) {
   console.log("Off wrist?");
 } else {
   console.log("Heart rate: " + hrm.heartRate);
   console.log("Zone: " + user.heartRateZone(hrm.heartRate));
 }
 lastReading = hrm.timestamp;
}