Optional Parameters

[leifi]

Hi all,

I've got a simple question:
is it possible in 3DFA to give your functions optional parameters?

// c shall be the optional parameter

function myFunction(a,b,c) {
   trace (a,b);
   trace (a,b,c);
}

myFunction(1,2,3); // everthing is ok...
myFunction(1,2); // 3DFA shows an error

Error:
function myFunction(a,b,c) was given 2 parameters when 3 were expected on line 9 myFunction(1,2)


Anyone knows how to solve this?

Thanks,
leifi

[kusco]

.. correction added ..

[Finjogi]

It is bit mixed bag.. if you supply only 2 params then you have to check if 3.rd one is null, if you have to check it then it is no pain to supply 3.rd parameter as null

However, function overloading could be more useful, you could define 2 same-name functions to work with 2 or 3 params.... but then it is only visual cleaniness as you define myFunc(a,b) and myFunc(a,b,c)... so why not just do it old fashion way myFunc1 and myFunc2

At the moment 3dfa does not accept multiple same name functions so... there is no much to do for now.

edit: I was slow

[kusco]

The next release of 3DFA, due later this week, allows the use of optional parameters for functions - for both Flash 8 and 9 export.

You can define a function ...

function my_function (a, b=42, c="hello", d=true)
{

}

... and you can specify between one and four parameters when calling the function.

[leifi]

Cool! Thank you for this fast response!
Maybe I have some more ideas for 3DFA...