accessing cameras.length

[ZedOfZardoz]

FIRST I am sure this is due to my programming ability not a bug in Instascan.

I want to use javascript to get cameras.length. I see in the demo that this is done but I do not want to use that template system.

I just can't get the cameras.length out of this section of code. I CAN see it in an "alert" placed inside this code but if I try to assign it to a "window" variable it is always undefined. Nothing I can find researching global variables can get the data out of this function.

This is one of the ways I've tried but I still get 999 in the 2nd alert. The "3rd alert" doesn't even come up.

`window.camq = {qty: 999);

  Instascan.Camera.getCameras().then(function (cameras) {
      alert('1st alert = ' + cameras.length);
      window.camq.qty = cameras.length; //  <----- MY NEW CODE
    if (cameras.length > 0) {
      scanner.start(cameras[0]);
    } else {
      console.error('No cameras found.');
    }
  }).catch(function (e) {
    console.error(e);
  });

alert('2nd alert' + window.camq.qty); alert('3rd alert' + cameras.length);

Thanks!