Create object in 'with' statement without using a variable - variables

Question

var
UserName, NickName, UserID: string;
begin
with TStringList.Create do
begin
CommaText := 'ali,veli,4950';
UserName := x[0]; //what is x ? (x is Tstringlist.create)
NickName := x[1];
UserID := x[2];
end;
end;
If I use the below code, it works. But I don't want to declare a variable. Can I use it with any variable?
In the with statement, how can I use it?
var
tsl: TStringList;
begin
tsl := TStringlist.Create;
with tsl do
begin
CommaText := 'ali,veli,4950';
UserName := tsl[0];
NickName := tsl[1];
UserID := tsl[2];
end;
end;

Answer 1

When an object is created directly in a with statement, there is no syntax to refer to that object (unless it provides a member that refers to itself, which is very rare), so you typically must use a variable, as your bottom code does.
Also, both codes are leaking the TStringList object, as you are not calling Free() on it when you are done using it.
That being said, in this particular example, the [] operator is just shorthand for accessing the TStrings.Strings[] default property, which you can access without needing a variable to the created TStringList object, just like you are doing with the TStrings.CommaText property, eg:
var
UserName, NickName, UserID: string;
Begin
with TStringList.Create do
try
CommaText := 'ali,veli,4950';
UserName := Strings[0];
NickName := Strings[1];
UserID := Strings[2];
finally
Free;
end;
end;