Suppose that you're writing a script that you want people to be able to use in their games. You need to store the Health for every character in the game, but you don't know how many characters there will be. What do you do?

Dynamic Arrays are designed for just this purpose. You can declare an array like this:

int characterHealth[];

in your script file. This special notation tells AGS that you don't yet know how large you want the array to be. Now, before you use the array (so probably in game_start), you can do this:

characterHealth = new int[Game.CharacterCount];

If you forget to do this new command, you'll get a Null Pointer Error if you try to access the array. You can change the size of an array by simply using another new command with a different size; but this will erase the contents of the array in the process.

Currently dynamic arrays are supported as global and local variables, but you can't put one inside a struct. Also, at present you can create arrays of basic types (int, char, etc) and of built-in types (String, Character, etc) but not of custom structs.