For loop

// Iterate over each object in the list using a for loop
var i;
for (i = 0; i < ds_list_size(objList); i++)
{
    // Get the object at the current index in the list
    var obj = ds_list_find_value(objList, i);

    // Code to be executed for each object in the list

    // Perform an action on the current object
    obj.action();
}


FOR ARRAY

// Create an array and add some objects to it
var objArray;
objArray[0] = obj_Object1;
objArray[1] = obj_Object2;
objArray[2] = obj_Object3;
objArray[3] = obj_Object4;

// Get the length of the array
var arrayLength = array_length_1d(objArray);

// Iterate over each object in the array using a for loop
var i;
for (i = 0; i < arrayLength; i++)
{
    // Get the object at the current index in the array
    var obj = objArray[i];

    // Code to be executed for each object in the array

    // Perform an action on the current object
    obj.action();
}



NULL VERIFICATION


if (obj != null)
    {
        // Code to be executed for non-null objects

        // Perform an action on the current object
        obj.action();
    }
    else
    {
        break
    }