Question about Checkboxes, Radio buttons and Sums in total

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$w.onReady(function () {
    $w("#checkboxGroup1").value = [1]===true;
    $w("#checkboxGroup2").value = "2";

    $w("#checkboxGroup1").onChange((event, $w) => {
        manageSum();
    });
    $w("#checkboxGroup2").onChange((event, $w) => {
        manageSum();
    });
    manageSum();
});

function manageSum() {
 var sum = 0;
 if ($w("#checkboxGroup1").checked) sum += Number($w("#checkboxGroup1").value);
 if ($w("#checkboxGroup2").checked) sum += Number($w("#checkboxGroup2").value);

    $w("#text141").text = "" + sum;
}

This is the code