Delphi StringBuilder

Question

Exists in Delphi something like the Java or C# StringBuilder? Or Delphi does not need StringBuilder and s := s + \'some string\'; is good expression (mainly in for,

Answer 1

s := s + 'some string' could be terribly slow if you do it in a loop because of the memory allocation involved. I have dome some tests that show that preallocating memory could be 132 times (YES YOU READ IT RIGHT) faster!!!!

The code is like this:

 marker:= 1;
 CurBuffLen:= 0;
 for i:= 1 to Length(FileBody) DO
  begin
   if i > CurBuffLen then
    begin
     SetLength(s, CurBuffLen+ BuffSize);
     CurBuffLen:= Length(s)
    end;
   s[marker]:= FileBody[i];
   Inc(marker);
  end;

See my answer here for details: When and Why Should I Use TStringBuilder?

Note: my code is optimized for

s:= s+ c

where c is a char, but you can easily adapt it

for s:= s + 'some string'

.