ASP and optional parameters

VBS does not enable optional parameters with function declaration.
The function declaration in VBS looks like :
[Public | Private] Function name [(arglist)]
    [statements]
    [name = expression]
    [Exit Function]
    [statements]
    [name = expression]
End Function
The arglist argument has the following syntax and parts:

[ByVal | ByRef] varname[( )]

Function declaration in JScript looks like :

function functionname([argument1 [, argument2 [, ...argumentn]]])
{
statements
}
Where argument1...argumentn are optional, comma-separated list of arguments the function understands. JScript has special array variable called 'arguments'. The variable can retrieve any of the function argument.
arguments[0] ... first argument of the function
arguments[1] ... second argument of the function, etc.
So you can use JScript to do the work :


function sprintf(Templ){
  var C = 1;
  var Pos = Templ.indexOf("%s");
  while(Pos>=0){
    Templ = Templ.substr(0, Pos) + arguments[C++] + Templ.substr(Pos+2)
    Pos = Templ.indexOf("%s")
  }
  return Templ;
};

Then you can call the function :

If Err<>0 Then
  Response.Write sprintf("The Function raises error %s (%s).", Err.Number, Err.Description)
End If

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 Title="Use optional parameters in VBS/JS."
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See also

Copyright and use this code