This function is used to create a new, empty, ds_map and will return its id which is then used to access the data structure in all other ds_map functions.IMPORTANT! When you create a data structure, the index value to identify it is an integer value starting at 0. This means that data structures of different types can have the same index value, so if in doubt you should be using the ds_exists function before accessing them. Also note that indices are re-used, so a destroyed data structure index value may be used by a newly created one afterwards.
Integer (DS map ID)
inventory = ds_map_create();
The above code will create a new, empty ds_map and store its id index in the variable "inventory".