Can I resize a Delphi array without losing its previous contents?

Question

I have a dynamic array. But initially I am not knowing the length of the array. Can I do like first I set the length of it as 1 and then increase length as I needed without lost of previously stored data?
I know I can do such task using TList. But I want to know whether I can do it with array or not?

Answer 1

Dynamic Arrays can be resized to a larger size without losing the contained data.

The following program demonstrates this in action.

program Project7;

{$APPTYPE CONSOLE}

uses
  SysUtils;
var
 A : Array of Integer;
 I : Integer;
begin
  for I := 0 to 19 do
  begin
    SetLength(A,I+1);
    A[I] := I;
  end;
  for I := Low(A) to High(A) do
  begin
    writeln(A[I]);
  end;
  readln;
end.