Count items selected in a list variable

[Cirrus]

Please could someone advise how to solve this.

I have a catalog item with a list variable, and I want to be able to count the number of elements selected, but if certain items are added to the list, I want to exclude these from the count. I already have two on change scripts doing similar things:

To count all items:

  value = g_form.getValue('catalogue');
   len = value.split(',').length;
    g_form.setValue('count', len);

And to manage behaviours based on items selected:

 var flg = 'false';
    //check the list collect doesnt contain any free items or is not empty
    var str = newValue.toString();
    var arr = str.split(',');
       for (var i = 0; i < arr.length; i++) {
        if (!((arr[i] == '5fb4d3091bd51d505ab1646fe54bcbea') || (arr[i] == ""))) {
        flg = 'true';
            break;
        }
    }if (flg == 'true........

I tried joining them with my limited scripting ability as follows, but the count still increments despite the free item 5fb4 being selected (unless its the only item). I know its because its set to count all values in the catalog field, but how can I set the count to ignore 5fb4 if its selected.

function onChange(control, oldValue, newValue, isLoading) {
   if (isLoading || newValue == '') {
      return;
   }
 var str = newValue.toString();
    var arr = str.split(',');
       for (var i = 0; i < arr.length; i++) {
        if (!(arr[i] == '5fb4d3091bd51d505ab1646fe54bcbea')) {
        
    value = g_form.getValue('catalogue');
   len = value.split(',').length;
    g_form.setValue('count', len);
        }
  }
}

Thanks

[Cirrus · Accepted solution]

Managed to solve it with the following:

function onChange(control, oldValue, newValue, isLoading) {
   if (isLoading || newValue == '') {
      return;
   }
    var a = '0';
    var str = newValue.toString();
    var arr = str.split(',');
    for (var i = 0; i < arr.length; i++) {
        
        if (arr[i] == '5fb4d3091bd51d505ab1646fe54bcbea') {
         a = '1';    
        }
    value = g_form.getValue('catalogue');
   len = value.split(',').length;
    g_form.setValue('count', (len-a));
}
}