How does a FOR loop work in GML?

Answer 1

FOR loops work as follows:

{

for( [initialize a variable]; [expression]; [increment the variable] ) {

//Do this code

}

}

Here as an example of a FOR loop:

{

for(i = 1; i < 10; i += 1) {

show_message(string(i));

}

}

What this will do is show a message 10 times displaying the value of "i" so you would get a message that says "1," another one after that saying "2," etc... The way this works is that you have the variable "i" initialized in the FOR loop. The FOR loop will keep looping until i >= 10, because the middle statement dictates that i must be smaller than 10 for the FOR loop activate. The third statement in the for loop is the statement that you increment the i variable with. If you change i += 1 to i -= 1 then the FOR loop would go on forever, freezing the game. This is a critical mistake to make when constructing a FOR loop (as is with any loop.)