Mobile Port

// oBird Step Event
//// JUMP
{
    if(keyboard_check_pressed(vk_space)){
        dy = jump_dy;
    }

    if(mouse_check_button_pressed(mb_left)){
        dy = jump_dy;
    }
}

There’s one way to do it. We already have an if statement for space, we just need another one for mouse pressed

But I’m a tad unsatisfied with this approach, because we’ve got some duplicated code in the dy = jump_dy; line. It’s not too bad now as we mentioned in the menus chapter, duplicate code should be avoided, and as the logic grows we could have a much bigger problem

Luckily there’s an easy fix 😉

// oBird Step Event
//// JUMP
{
    if(keyboard_check_pressed(vk_space) or mouse_check_button_pressed(mb_left)){
        dy = jump_dy;
    }
}

That’s right! You can put both of them in the same condition by using or!

More formally, or is an example of a Boolean Logic Operator. These operators let you combine boolean values to become a different boolean value. The or operator will output true if EITHER of the 2 booleans are true. The other popular operator is and which will only output true if BOTH booleans are true

And then to be thorough, there’s also not. This only applies to a single boolean and just returns the opposite. For example if(not position_meeting(mouse_x, mouse_y, id)){ sprite_index = sButton; } would have been a valid way to set the default sprite for our button (I prefer the else approach, but not is also an option )

**What about &&,

, and !?** oh I see this isn’t your first rodeo 🤓. Many languages (C, C++, Java, etc), use &&,

, ! instead of and, or, not. You can actually use these symbols in Game Maker as well, and many people prefer them. For me personally, I used to like &&,

, !, because it let me save a letter on the and, but also probably because it made me feel smarter. Once I started writing python I was forced to use and, or, not, then ever since I adapted my style in Game Maker as well. Now I prefer and, or, not because it makes my code more colorful w/ game maker’s sytax highlighting, and it’s also more readable in general