GMS2 Simple Menu

// Very simple menu with no sub-menus

// Struct
function MenuItem(_label, _action) constructor
{
    Label   = _label;
    Execute = _action;

    function Draw(_x, _y, _c)
    {
        draw_text_color(_x, _y, Label, _c, _c, _c, _c, 1);
    }
}

// Create
MenuChoice = 0;
Menu =
[
    new MenuItem("Start Game", function() { room_goto(RMGame)}),
    new MenuItem("Exit Game", game_end )
];

// Step
MenuChoice += (keyboard_check_pressed(vk_up) - keyboard_check_pressed(vk_down));
var _length = array_length(Menu);
MenuChoice = (_length + MenuChoice) mod _length; // Looping clamp

if keyboard_check_pressed(vk_space) Menu[MenuChoice].Execute();

// Draw
for (var _i = 0, _h = string_height("H"), _length = array_length(Menu); _i < _length; _i++)
    Menu[_i].Draw(x, y + _i * _h, c_white);

Menu[MenuChoice].Draw(x, y + MenuChoice * _h, c_yellow);