label

const A = $.makeButton($.w/2, 30, 150, 30, "blank");
const B = $.makeButton($.w/2, 60, 150, 30, "blank");
const C = $.makeButton($.w/2, 90, 150, 30, "blank");

function update() {
    A.label = "Button A";
    B.label = "Button B";
    C.label = "Button C";
    A.draw();
    B.draw();
    C.draw();
}