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Script function has the following structure:

 

procedure|function <name>( [parameters] ) [: <result type>]);
[ var <variables>; ]
begin
 <function body>
end;

 

Example:

 

function Substring(s: string; Start, Len: integer): string;
begin
  Result := copy(s, Start, Len)
end;

 

functions can have default parameters.

Example:

 

function Substring(s: string; Start: integer = 1; Len: integer = MaxInt): string;
begin
  Result := copy(s, Start, Len)
end;