After all these years, Delphi still surprises me. Apparently, as I found out today (by making a stupid typo), Copy(string, index, position) doesn't require position parameter!
IOW, following two lines do exactly the same:
s := Copy('123456789', 4, 6);
s := Copy('123456789', 4);
Works for arrays, too!
Of course, this is not
documented.
See for yourself:
program ProjectCopy;
{$APPTYPE CONSOLE}
{$R *.res}
uses
SysUtils;
var
s1: TArray;
begin
Writeln(Copy('123456789', 4, 6));
Writeln(Copy('123456789', 4));
s1 := ['1', '2', '3'];
Writeln(string.Join(',', Copy(s1, 1, 2)));
Writeln(string.Join(',', Copy(s1, 1)));
Readln;
end.
This code outputs (in Tokyo):
456789
456789
2,3
2,3
I'd suspect that this goes waaaaaay back. I tested string version with XE2 and it works the same as in Tokyo.
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