![]() ![]() ![]() ![]() If you run into a tricky debugging problem, check if you're accidentally creating a local variable. The best way to avoid these issues is to make sure for now that you're not using var inside of an onEvent or function. This can cause unexpected behavior in your code and it can get tricky to debug. While it looks like there's only one variable being used, it actually has two variables, one local, and one global, and they're both named count! Changing the value of one will have no impact on the other. The biggest issue you'll run into right now with local variables is accidentally using var inside of an onEvent or function. Local variables will eventually be useful but for now they're most likely to just be confusing. Just like local variables, global variables must be declared, but unlike a local variable, a global variable remains in memory until the end of the game. It is a very powerful utility for programmers and non-programmers alike to create 2D games of old, classic games such as platformers, top-down shooters, puzzlers, RPGs, etc. Deleted once the onEvent is done running. A basic description of a global variable is one that, once declared, belongs to no instance in particular and yet can be accessed by all. Program Information The program that this document shall focus on is Game Maker 4.0, by Mark Overmars. Can be used only in the part of the code where it was created, like inside an onEvent. Here's the main difference between global and local variables. There's two types of variables, global and local, and so far we've only used global variables. Create your variables outside any function or onEvent blocks.This keeps your code organized and easier to read for you and others. Create your variables at the top of your program.You don't need to create variables twice and this can cause errors. Debugging Variable Scope: Functions Create Variables Once, At the Top, Outside Functions or onEvent() ![]()
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