custom ui object attribute JqueryUI Autocomplete

custom.property.js

var carMake = [{
    "make": "Smart",
        "id": '200038885'
}, {
    "make": "Bomb",
        "id": '200038885'
}, {

    "make": "Volkswagen",
        "id": '200000238'
}];

function addlabel(row) {
    row.label = row.make;
    row.value = row.id;
}
carMake.forEach(addlabel);
$("#vehicle_make").autocomplete({
    source: carMake,
    delay: 0,
    minLength: 1,
    autoFocus: false,
    select: function (event, ui) {
        $(this).val(ui.item.make);
        return false;
    }
});