$("input[type=checkbox]").on("click", function (event) {
    let isChecked = event.currentTarget.checked;
    // Do something
});

$("input[type=checkbox]")
    .on("click change", function (event) {
        let isChecked = event.currentTarget.checked;
        // Do something
    })
    .change();

$("input[type=checkbox]").onAndNow("click", function (event) {
    let isChecked = event.currentTarget.checked;
    // Do something
});

function onCheckboxClicked(event) {
    let isChecked = event.currentTarget.checked;
    // Do something
}
$("input[type=checkbox]").on("click", onCheckboxClicked);
onCheckboxClicked(???);