Question

I need a clarification of this case.

According my tests the Result variable is defined to:
Boolean=False, Integer=0, String=”, Object=nil etc from the first line.
But I have never seen an official reference for this.
It also make sense as this gives the hint.

[DCC Warning] Unit1.pas(35): H2077 Value assigned to ‘TForm1.Test’ never used

function TForm1.Test: Boolean;
begin
  Result := False;
  // Some arbitrary code here

  Result := True;
end;

But what happens if I comment out the first line and there is an exception somewhere before last line? Is Result = False ?

If Result is undefined this means that I always have to start every function by defining Result in case of exception later. And this make no sense for me.

Answer 1

No, Result has no (guaranteed) default value. It is undefined unless you give it a value. This is implied by the documentation, which states

If the function exits without assigning a value to Result or the
function name, then the function’s return value is undefined.

I just tried

function test: integer;
begin
  ShowMessage(IntToStr(result));
end;

and got a message with the text 35531136.