// where we have two arrays of checked and unchecked 

 function onHandleCheckbox(checkbox) {
        // create a new attay of objects with the value and checked status
        checkbox.addEventListener("change", () => {
            const status = [...trainingRadioBtns].map((btn) => ({
                value: btn.value,
                checked: btn.checked,
            }));
            // update global checkedValues array with objects of items that are checked then another with items unchecked
            checkedValues = status.filter((btn) => btn.checked).map((btn) => btn.value);
            notSelected = status.filter((btn) => !btn.checked).map((btn) => btn.value);
            // console.log("selected", checkedValues);
            // console.log("not selected", notSelected);

            // return values to the filteredItems array that match the below
            filteredItems = locations.filter((item) => {
                // Each individual match condition for filtering from the checkedvalues array or the notselected array
                const matchesFunded = (checkedValues.includes("governmentService") && item.governmentService) || notSelected.includes("governmentService");
                const matchesOnline = (checkedValues.includes("isAvailableOnline") && item.isAvailableOnline) || notSelected.includes("isAvailableOnline");
                const matchesPartTime = (checkedValues.includes("isAvailablePartTime") && item.isAvailablePartTime) || notSelected.includes("isAvailablePartTime");
                const matchesApprentice = (checkedValues.includes("apprenticeshipTraineeship") && item.apprenticeshipTraineeship) || notSelected.includes("apprenticeshipTraineeship");
                const matchesVetFeeCourse = (checkedValues.includes("isVetFeeCourse") && item.isVetFeeCourse) || notSelected.includes("isVetFeeCourse");

                // Check if the item matches All of the selected filters and return
                return matchesFunded && matchesOnline & matchesPartTime & matchesApprentice & matchesVetFeeCourse;
            });

            // updating functions
            noLocationsOverlay(filteredItems);

            checkLoadButton(filteredItems);

            displayLocations();

            updateMarkers(filteredItems);
        });
    }