Using a function to read sensor values

I am writing a function which returns two values from different Aqara sensors.
But I only get values from the same sensor, how should I rewrite this code:

let devices = await Homey.devices.getDevices();
let sensor;

function readvalues(sensorID){  
Object.values(devices).forEach(device => {
if (device.id = sensorID) {                
            sensor = device;
        }       
    });
    var RH = sensor.capabilitiesObj.measure_humidity.value;
    var Temp = sensor.capabilitiesObj.measure_temperature.value;
return [RH,Temp];
}
var values = readvalues("87dd5a75-7948-4be2-8a27-49bb8b2b5f6c");
log (values);

var values2 = (readvalues("d03e1905-3a79-4fa3-8371-eaafee164925"));
log (values2);

return values[0]-values2[0];

This is the result:

[ 59.9, 20.5 ]
[ 59.9, 20.5 ]


Script returned:
0

That’s an assignment, not a comparison. You should use == or (preferably) ===.