updating list inside a function

[#1]

Hey guys,

I'm trying to add a new value (variable value) to a list inside a function, each time the function has been called.

No matter what I tried, the list is not getting any value. 

Any advice?

Adding the example of the code

[#2]

I think it is better idea to return the new column and then add that outside of the function call

Names Default To Here(1);

dt = Open("\\VMSPFSFSLC001\F28_PLI\SQL\FE SQL\Data\Oxide .CSV");

op_list = List();

add_new_operation = Function({dt, col_name, op, PLmin, PLmax}, {Default Local},
	new_col = dt << New Column(col_name,
		Character,
		"Nominal",
		Formula(
			If(/*some conditions for the value*/
			)
 		
		)
	);
	
	return(new_col);
);

sticol = add_new_operation(dt, "STI", 201405, 80, 2000);
Insert Into(op_list, sticol);

Show(op_list);


// This should also work
// Insert into(op_list, add_new_operation(dt, "STI", 201405, 80, 2000));

Full example

Names Default To Here(1);

dt = Open("$SAMPLE_DATA/Big Class.jmp");

op_list = {};

add_new_operation = Function({dt, col_name}, {Default Local},
	new_col = dt << New Column(col_name,
		Character,
		"Nominal",
		Formula(
			col_name
		)
	);
	
	return(new_col);
);

Show(op_list); // op_list = {};
Insert into(op_list, add_new_operation(dt, "name"));
Insert into(op_list, add_new_operation(dt, "age"));
Show(op_list); // op_list = {Column("name 2"), Column("age 2")};
 

[#3]

And if you really want to insert into the list created outside of the function, remove {Default Local} from your function (there are also other methods) but I wouldn't recommend this. One reason being that now you have to have op_list always created before the function is called.

Names Default To Here(1);

dt = Open("$SAMPLE_DATA/Big Class.jmp");

op_list = {};

add_new_operation = Function({dt, col_name},
	new_col = dt << New Column(col_name,
		Character,
		"Nominal",
		Formula(
			col_name
		)
	);
	
	Insert Into(op_list, new_col);
);

Show(op_list); // op_list = {};
add_new_operation(dt, "name");
add_new_operation(dt, "age");
Show(op_list); // op_list = {Column("name 2"), Column("age 2")};