Initializing in the definition works only for simple arrays; multidimensional arrays, arrays that contain strings, structs, or anything else than numbers, or several arrays defined together in a single logical line must be initialized by explicitly setting their elements. Initializing local arrays makes them static (see below), meaning that they keep their previous values when the function is called the next time. For initializing them every time the function is called, explicitly set them to their initial values, like this:
function foo()
{
var my_vector[3];
my_vector[0] = 10;
my_vector[1] = 20;
my_vector[2] = 30;
...
var my_static[3] = { 10, 20, 30 }; // initializing local arrays makes them static
...
}
